CriticalCVE-2026-20127

    Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability (CVE-2026-20127)

    Published Last modified In CISA KEV since Sources: pwn.watch, CERT-EU, Cisco PSIRT, SingCERT, NCSC NZ, CVE.org

    What is affected, what to do

    A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly.

    The vulnerability is being actively exploited; treat it as a priority. Update catalyst_sd-wan_manager to version 20.18.2.1, sd-wan_vbond_orchestrator to version 20.12.5.3, sd-wan_vsmart_controller to version 20.18.2.1. Immediate actions, mitigation and detection rules are in the runbook below.

    Affected
    • Cisco Catalyst SD-WAN Manager eq 20.1.12..20.1.12
    • Cisco Catalyst SD-WAN Manager eq 19.2.1..19.2.1
    • Cisco Catalyst SD-WAN Manager eq 18.4.4..18.4.4
    • Cisco Catalyst SD-WAN Manager eq 18.4.5..18.4.5
    • Cisco Catalyst SD-WAN Manager eq 20.1.1.1..20.1.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.1.1..20.1.1
    • Cisco Catalyst SD-WAN Manager eq 19.3.0..19.3.0
    • Cisco Catalyst SD-WAN Manager eq 19.2.2..19.2.2
    • Cisco Catalyst SD-WAN Manager eq 19.2.099..19.2.099
    • Cisco Catalyst SD-WAN Manager eq 18.3.6..18.3.6
    • Cisco Catalyst SD-WAN Manager eq 18.3.7..18.3.7
    • Cisco Catalyst SD-WAN Manager eq 19.2.0..19.2.0
    • Cisco Catalyst SD-WAN Manager eq 18.3.8..18.3.8
    • Cisco Catalyst SD-WAN Manager eq 19.0.0..19.0.0
    • Cisco Catalyst SD-WAN Manager eq 19.1.0..19.1.0
    • Cisco Catalyst SD-WAN Manager eq 18.4.302..18.4.302
    • Cisco Catalyst SD-WAN Manager eq 18.4.303..18.4.303
    • Cisco Catalyst SD-WAN Manager eq 19.2.097..19.2.097
    • Cisco Catalyst SD-WAN Manager eq 19.2.098..19.2.098
    • Cisco Catalyst SD-WAN Manager eq 17.2.10..17.2.10
    • Cisco Catalyst SD-WAN Manager eq 18.3.6.1..18.3.6.1
    • Cisco Catalyst SD-WAN Manager eq 19.0.1a..19.0.1a
    • Cisco Catalyst SD-WAN Manager eq 18.2.0..18.2.0
    • Cisco Catalyst SD-WAN Manager eq 18.4.3..18.4.3
    • Cisco Catalyst SD-WAN Manager eq 18.4.1..18.4.1
    • Cisco Catalyst SD-WAN Manager eq 17.2.8..17.2.8
    • Cisco Catalyst SD-WAN Manager eq 18.3.3.1..18.3.3.1
    • Cisco Catalyst SD-WAN Manager eq 18.4.0..18.4.0
    • Cisco Catalyst SD-WAN Manager eq 18.3.1..18.3.1
    • Cisco Catalyst SD-WAN Manager eq 17.2.6..17.2.6
    • Cisco Catalyst SD-WAN Manager eq 17.2.9..17.2.9
    • Cisco Catalyst SD-WAN Manager eq 18.3.4..18.3.4
    • Cisco Catalyst SD-WAN Manager eq 17.2.5..17.2.5
    • Cisco Catalyst SD-WAN Manager eq 18.3.1.1..18.3.1.1
    • Cisco Catalyst SD-WAN Manager eq 18.3.5..18.3.5
    • Cisco Catalyst SD-WAN Manager eq 18.4.0.1..18.4.0.1
    • Cisco Catalyst SD-WAN Manager eq 18.3.3..18.3.3
    • Cisco Catalyst SD-WAN Manager eq 17.2.7..17.2.7
    • Cisco Catalyst SD-WAN Manager eq 17.2.4..17.2.4
    • Cisco Catalyst SD-WAN Manager eq 18.3.0..18.3.0
    • Cisco Catalyst SD-WAN Manager eq 19.2.3..19.2.3
    • Cisco Catalyst SD-WAN Manager eq 18.4.501_ES..18.4.501_ES
    • Cisco Catalyst SD-WAN Manager eq 20.3.1..20.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.1.2..20.1.2
    • Cisco Catalyst SD-WAN Manager eq 19.2.929..19.2.929
    • Cisco Catalyst SD-WAN Manager eq 19.2.31..19.2.31
    • Cisco Catalyst SD-WAN Manager eq 20.3.2..20.3.2
    • Cisco Catalyst SD-WAN Manager eq 19.2.32..19.2.32
    • Cisco Catalyst SD-WAN Manager eq 20.3.2_925..20.3.2_925
    • Cisco Catalyst SD-WAN Manager eq 20.3.2.1..20.3.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.2.1_927..20.3.2.1_927
    • Cisco Catalyst SD-WAN Manager eq 18.4.6..18.4.6
    • Cisco Catalyst SD-WAN Manager eq 20.1.2_937..20.1.2_937
    • Cisco Catalyst SD-WAN Manager eq 20.4.1..20.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.2_928..20.3.2_928
    • Cisco Catalyst SD-WAN Manager eq 20.3.2_929..20.3.2_929
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.0.1..20.4.1.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.2.1_930..20.3.2.1_930
    • Cisco Catalyst SD-WAN Manager eq 19.2.4..19.2.4
    • Cisco Catalyst SD-WAN Manager eq 20.5.0.1.1..20.5.0.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.1..20.4.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.3..20.3.3
    • Cisco Catalyst SD-WAN Manager eq 19.2.4.0.1..19.2.4.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.2_937..20.3.2_937
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1..20.3.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.5.1..20.5.1
    • Cisco Catalyst SD-WAN Manager eq 20.1.3..20.1.3
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.4..20.3.3.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1.2..20.3.3.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1.1..20.3.3.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.2..20.4.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.2..20.3.3.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.1.5..20.4.1.1.5
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.0.01..20.4.1.0.01
    • Cisco Catalyst SD-WAN Manager eq 20.4.1.0.02..20.4.1.0.02
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1.7..20.3.3.1.7
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1.5..20.3.3.1.5
    • Cisco Catalyst SD-WAN Manager eq 20.5.1.0.1..20.5.1.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.1.10..20.3.3.1.10
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.8..20.3.3.0.8
    • Cisco Catalyst SD-WAN Manager eq 20.4.2..20.4.2
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.0.1..20.4.2.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4..20.3.4
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.14..20.3.3.0.14
    • Cisco Catalyst SD-WAN Manager eq 19.2.4.0.8..19.2.4.0.8
    • Cisco Catalyst SD-WAN Manager eq 19.2.4.0.9..19.2.4.0.9
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.1..20.3.4.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.2.0.5..20.3.2.0.5
    • Cisco Catalyst SD-WAN Manager eq 20.6.1..20.6.1
    • Cisco Catalyst SD-WAN Manager eq 20.5.1.0.2..20.5.1.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.17..20.3.3.0.17
    • Cisco Catalyst SD-WAN Manager eq 20.6.1.1..20.6.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.0.18.3..20.6.0.18.3
    • Cisco Catalyst SD-WAN Manager eq 20.3.2.0.6..20.3.2.0.6
    • Cisco Catalyst SD-WAN Manager eq 20.6.0.18.4..20.6.0.18.4
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.0.2..20.4.2.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.16..20.3.3.0.16
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.5..20.3.4.0.5
    • Cisco Catalyst SD-WAN Manager eq 20.6.1.0.1..20.6.1.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.6..20.3.4.0.6
    • Cisco Catalyst SD-WAN Manager eq 20.6.2..20.6.2
    • Cisco Catalyst SD-WAN Manager eq 20.7.1EFT2..20.7.1EFT2
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.9..20.3.4.0.9
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.11..20.3.4.0.11
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.0.4..20.4.2.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.0.18..20.3.3.0.18
    • Cisco Catalyst SD-WAN Manager eq 20.7.1..20.7.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.1..20.6.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.1..20.3.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.5.1.1..20.5.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.1..20.4.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.1.1..20.4.2.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.1.1..20.3.4.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.813..20.3.813
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.19..20.3.4.0.19
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2.1..20.4.2.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.5.1.2..20.5.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.2..20.3.4.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.814..20.3.814
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2..20.4.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.2..20.6.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.2.1..20.3.4.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.7.1.1..20.7.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.1.2..20.3.4.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.2.2..20.6.2.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.20..20.3.4.0.20
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.2.3..20.6.2.2.3
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2.2..20.4.2.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.5..20.3.5
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.0.4..20.6.2.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2.3..20.4.2.2.3
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.24..20.3.4.0.24
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.2.7..20.6.2.2.7
    • Cisco Catalyst SD-WAN Manager eq 20.6.3..20.6.3
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.2.2..20.3.4.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2.4..20.4.2.2.4
    • Cisco Catalyst SD-WAN Manager eq 20.7.1.0.2..20.7.1.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.8.1..20.8.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.5.0.8..20.3.5.0.8
    • Cisco Catalyst SD-WAN Manager eq 20.3.5.0.9..20.3.5.0.9
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.2.8..20.4.2.2.8
    • Cisco Catalyst SD-WAN Manager eq 20.3.5.0.7..20.3.5.0.7
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.7..20.6.3.0.7
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.5..20.6.3.0.5
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.10..20.6.3.0.10
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.2..20.6.3.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.7.2..20.7.2
    • Cisco Catalyst SD-WAN Manager eq 20.9.1EFT2..20.9.1EFT2
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.11..20.6.3.0.11
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.1..20.6.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.14..20.6.3.0.14
    • Cisco Catalyst SD-WAN Manager eq 20.6.4..20.6.4
    • Cisco Catalyst SD-WAN Manager eq 20.9.1..20.9.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.19..20.6.3.0.19
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.18..20.6.3.0.18
    • Cisco Catalyst SD-WAN Manager eq 20.3.6..20.3.6
    • Cisco Catalyst SD-WAN Manager eq 20.9.1.1..20.9.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.23..20.6.3.0.23
    • Cisco Catalyst SD-WAN Manager eq 20.6.4.0.4..20.6.4.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.25..20.6.3.0.25
    • Cisco Catalyst SD-WAN Manager eq 20.6.5..20.6.5
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.27..20.6.3.0.27
    • Cisco Catalyst SD-WAN Manager eq 20.9.2..20.9.2
    • Cisco Catalyst SD-WAN Manager eq 20.9.2.1..20.9.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.29..20.6.3.0.29
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.31..20.6.3.0.31
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.32..20.6.3.0.32
    • Cisco Catalyst SD-WAN Manager eq 20.10.1..20.10.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.33..20.6.3.0.33
    • Cisco Catalyst SD-WAN Manager eq 20.9.2.0.01..20.9.2.0.01
    • Cisco Catalyst SD-WAN Manager eq 20.9.1_LI_Images..20.9.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.10.1_LI_Images..20.10.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.2_LI_Images..20.9.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.3.7..20.3.7
    • Cisco Catalyst SD-WAN Manager eq 20.9.3..20.9.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1..20.6.5.1
    • Cisco Catalyst SD-WAN Manager eq 20.11.1..20.11.1
    • Cisco Catalyst SD-WAN Manager eq 20.11.1_LI_Images..20.11.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.3_LI_ Images..20.9.3_LI_ Images
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.1.1..20.6.3.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.2..20.9.3.0.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.2..20.6.5.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.3..20.9.3.0.3
    • Cisco Catalyst SD-WAN Manager eq 20.4.2.3..20.4.2.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.2..20.6.3.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.4.1..20.6.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.38..20.6.3.0.38
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.39..20.6.3.0.39
    • Cisco Catalyst SD-WAN Manager eq 20.3.5.1..20.3.5.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.3..20.3.4.3
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.1..20.9.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.3.2..20.3.3.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.2..20.6.5.2
    • Cisco Catalyst SD-WAN Manager eq 20.3.7.1..20.3.7.1
    • Cisco Catalyst SD-WAN Manager eq 20.10.1.1..20.10.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.2.1..20.6.5.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.25..20.3.4.0.25
    • Cisco Catalyst SD-WAN Manager eq 20.6.2.2.4..20.6.2.2.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.1.2..20.6.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.11.1.1..20.11.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.5..20.9.3.0.5
    • Cisco Catalyst SD-WAN Manager eq 20.3.4.0.26..20.3.4.0.26
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.3..20.6.5.1.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.40..20.6.3.0.40
    • Cisco Catalyst SD-WAN Manager eq 20.1.3.1..20.1.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.2.2..20.9.2.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.2.3..20.6.5.2.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.4..20.6.5.1.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.3..20.6.5.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.41..20.6.3.0.41
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.7..20.9.3.0.7
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.5..20.6.5.1.5
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.4..20.9.3.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.4.0.19..20.6.4.0.19
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.6..20.6.5.1.6
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.8..20.9.3.0.8
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.3..20.6.3.3
    • Cisco Catalyst SD-WAN Manager eq 20.3.7.2..20.3.7.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.4..20.6.5.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.7..20.6.5.1.7
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.12..20.9.3.0.12
    • Cisco Catalyst SD-WAN Manager eq 20.6.4.2..20.6.4.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.5..20.6.5.5
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.2..20.9.3.2
    • Cisco Catalyst SD-WAN Manager eq 20.11.1.2..20.11.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.4..20.6.3.4
    • Cisco Catalyst SD-WAN Manager eq 20.10.1.2..20.10.1.2
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.9..20.6.5.1.9
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.16..20.9.3.0.16
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.45..20.6.3.0.45
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.10..20.6.5.1.10
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.17..20.9.3.0.17
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.2.4..20.6.5.2.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.4.0.21..20.6.4.0.21
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.18..20.9.3.0.18
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.46..20.6.3.0.46
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.47..20.6.3.0.47
    • Cisco Catalyst SD-WAN Manager eq 20.9.2.3..20.9.2.3
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.2_LI_Images..20.9.3.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.21..20.9.3.0.21
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.20..20.9.3.0.20
    • Cisco Catalyst SD-WAN Manager eq 20.9.4_LI_Images..20.9.4_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.4..20.9.4
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.11..20.6.5.1.11
    • Cisco Catalyst SD-WAN Manager eq 20.12.1..20.12.1
    • Cisco Catalyst SD-WAN Manager eq 20.12.1_LI_Images..20.12.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.13..20.6.5.1.13
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.23..20.9.3.0.23
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.2.8..20.6.5.2.8
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.1..20.9.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.1_LI_Images..20.9.4.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.25..20.9.3.0.25
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.24..20.9.3.0.24
    • Cisco Catalyst SD-WAN Manager eq 20.6.5.1.14..20.6.5.1.14
    • Cisco Catalyst SD-WAN Manager eq 20.3.8..20.3.8
    • Cisco Catalyst SD-WAN Manager eq 20.6.6..20.6.6
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.26..20.9.3.0.26
    • Cisco Catalyst SD-WAN Manager eq 20.6.3.0.51..20.6.3.0.51
    • Cisco Catalyst SD-WAN Manager eq 20.9.3.0.29..20.9.3.0.29
    • Cisco Catalyst SD-WAN Manager eq 20.12.2..20.12.2
    • Cisco Catalyst SD-WAN Manager eq 20.12.2_LI_Images..20.12.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.6.6.0.1..20.6.6.0.1
    • Cisco Catalyst SD-WAN Manager eq 20.13.1_LI_Images..20.13.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.0.4..20.9.4.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.13.1..20.13.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.1.1..20.9.4.1.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.5..20.9.5
    • Cisco Catalyst SD-WAN Manager eq 20.9.5_LI_Images..20.9.5_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.3_LI_Images..20.12.3_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.3..20.12.3
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.1.3..20.9.4.1.3
    • Cisco Catalyst SD-WAN Manager eq 20.6.7..20.6.7
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.1..20.9.5.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.1_LI_Images..20.9.5.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.4.1.6..20.9.4.1.6
    • Cisco Catalyst SD-WAN Manager eq 20.14.1..20.14.1
    • Cisco Catalyst SD-WAN Manager eq 20.14.1_LI_Images..20.14.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2..20.9.5.2
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.1..20.9.5.2.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2_LI_Images..20.9.5.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.3.1..20.12.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.12.4..20.12.4
    • Cisco Catalyst SD-WAN Manager eq 20.15.1_LI_Images..20.15.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.15.1..20.15.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.1.4..20.9.5.1.4
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.7..20.9.5.2.7
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.13..20.9.5.2.13
    • Cisco Catalyst SD-WAN Manager eq 20.9.6..20.9.6
    • Cisco Catalyst SD-WAN Manager eq 20.9.6_LI_Images..20.9.6_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.14..20.9.5.2.14
    • Cisco Catalyst SD-WAN Manager eq 20.6.8..20.6.8
    • Cisco Catalyst SD-WAN Manager eq 20.12.4.0.03..20.12.4.0.03
    • Cisco Catalyst SD-WAN Manager eq 20.16.1..20.16.1
    • Cisco Catalyst SD-WAN Manager eq 20.16.1_LI_Images..20.16.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.4_LI_Images..20.12.4_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.16..20.9.5.2.16
    • Cisco Catalyst SD-WAN Manager eq 20.12.4.0.4..20.12.4.0.4
    • Cisco Catalyst SD-WAN Manager eq 20.12.401..20.12.401
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.3..20.9.5.3
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.3_LI_Images..20.9.5.3_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.4.1_LI_Images..20.12.4.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.4.1..20.12.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.9.5.2.21..20.9.5.2.21
    • Cisco Catalyst SD-WAN Manager eq 20.9.6.0.3..20.9.6.0.3
    • Cisco Catalyst SD-WAN Manager eq 20.12.4.0.6..20.12.4.0.6
    • Cisco Catalyst SD-WAN Manager eq 20.15.2_LI_Images..20.15.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.15.2..20.15.2
    • Cisco Catalyst SD-WAN Manager eq 20.12.4_Monthly_ES5..20.12.4_Monthly_ES5
    • Cisco Catalyst SD-WAN Manager eq 20.12.5..20.12.5
    • Cisco Catalyst SD-WAN Manager eq 20.12.5_LI_Images..20.12.5_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.7_LI _Images..20.9.7_LI _Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.7..20.9.7
    • Cisco Catalyst SD-WAN Manager eq 20.15.3..20.15.3
    • Cisco Catalyst SD-WAN Manager eq 20.15.3_ LI _Images..20.15.3_ LI _Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.501..20.12.501
    • Cisco Catalyst SD-WAN Manager eq 20.12.5.1_LI_Images..20.12.5.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.5.1..20.12.5.1
    • Cisco Catalyst SD-WAN Manager eq 20.12.5.2_LI_Images..20.12.5.2_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.5.2..20.12.5.2
    • Cisco Catalyst SD-WAN Manager eq 20.15.3.1..20.15.3.1
    • Cisco Catalyst SD-WAN Manager eq 20.15.4_LI_Images..20.15.4_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.15.4..20.15.4
    • Cisco Catalyst SD-WAN Manager eq 20.9.7.1_LI _Images..20.9.7.1_LI _Images
    • Cisco Catalyst SD-WAN Manager eq 20.9.7.1..20.9.7.1
    • Cisco Catalyst SD-WAN Manager eq 20.18.1..20.18.1
    • Cisco Catalyst SD-WAN Manager eq 20.18.1_LI_Images..20.18.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.6_LI_Images..20.12.6_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.12.6..20.12.6
    • Cisco Catalyst SD-WAN Manager eq 20.12.5.1.01..20.12.5.1.01
    • Cisco Catalyst SD-WAN Manager eq 20.9.8..20.9.8
    • Cisco Catalyst SD-WAN Manager eq 20.9.8_LI_Images..20.9.8_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.18.2..20.18.2
    • Cisco Catalyst SD-WAN Manager eq 20.15.4.1_LI_Images..20.15.4.1_LI_Images
    • Cisco Catalyst SD-WAN Manager eq 20.15.4.1..20.15.4.1
    • Cisco Catalyst SD-WAN Manager eq 20.18.2_LI_Images..20.18.2_LI_Images

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    10.0

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    10.0

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: pwn.watch, CERT-EU, Cisco PSIRT, SingCERT, NCSC NZ, CVE.org

    89.3 %

    EPSS score

    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

    Source: FIRST EPSS, percentile 99.78

    Show all metrics
    Severity
    Critical
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    244.29 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    actively exploitedSource: VulnCheck KEV (opens in a new tab), CERT.at, ANSSI / CERT-FR, CIRCL Sightings, CSA/SingCERT How we classify
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    10.0 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    10.0
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    89.3 %
    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    99.78
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    Actively exploited
    Published
    In CISA KEV since

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    CISA assessment (SSVC)
    Exploitation: active · automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 26 February 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-287

    Response and mitigation

    Why act now?

    Prioritisation rationale

    This flaw is network-reachable without authentication and has a scope change: the attacker does not just own a controller, but gains NETCONF control over the whole SD-WAN fabric. From there they can reroute traffic, collapse segmentation or cut off sites. Exploitation likelihood is very high, placing it among the CVEs most likely to be exploited. CISA does not flag ransomware use, but the profile fits targeted espionage and pre-positioning against carriers, critical infrastructure and multi-site enterprises. Treat internet-reachable controllers as critical with remediation in hours. Rate internal-only instances as high and prioritise them for compromise assessment.

    1. Runbook step 1

      Immediate response (0-24 h)

      • Inventory and version check: Enumerate every Catalyst SD-WAN Manager (vManage), Controller (vSmart) and Validator (vBond) instance, including Cisco-hosted cloud deployments. Confirm versions via show version or the Manager GUI. Versions 18.4.4, 18.4.5, 19.2.1, 19.2.2, 19.3.0, 20.1.1, 20.1.1.1 and 20.1.12 are listed as affected. Cross-check other trains against the Cisco advisory, as the supplied list may be incomplete.
      • Patch: A fix is available from the vendor — look up the fixed release in the Cisco Security Advisory for CVE-2026-20127. Follow Cisco's upgrade order (Manager → Validator → Controller → Edge). End-of-support trains (18.x/19.x/20.1) need a migration plan rather than a hotfix.
      • Cut exposure now: Remove controller management and control-plane interfaces from the internet, or restrict them by ACL to known edge WAN IPs and admin jump hosts. Typical defaults are HTTPS 443/8443 (Manager), NETCONF TCP 830, SSH 22 and the DTLS/TLS control ports (UDP 12346+, TCP 23456+); verify the actual ports against your own configuration.
      • Compromise check before patching: On every controller, capture show control connections, show orchestrator connections and the local user list. Record any unknown peers (system IP, serial, public IP), new accounts or SSH keys, and preserve snapshots and logs for forensics.
      • Rotate secrets: After patching, reset local admin passwords, API tokens and SSH keys. If compromise cannot be ruled out, also re-issue controller certificates and re-push the device allowlist.
      • Regulatory clock: If fabric configuration tampering is suspected, start the NIS2 early-warning process (24 h).

    2. Runbook step 2

      Mitigation layers

      • Network segmentation: Move controllers into a dedicated management VRF/VLAN. Allow inbound control-port traffic only from the authorised edge address list. Permit NETCONF (TCP 830) and SSH only from PAWs or jump hosts. Restrict controller egress to known destinations (NTP, syslog, Cisco cloud).
      • Perimeter ACL / IPS: Put a geo and IP allowlist in front of internet-facing Validators. Enable the vendor IPS signatures (Snort/Talos rules for CVE-2026-20127, once published) in drop mode. Alert on abnormal DTLS handshake rates on UDP 12346 with a threshold rule.
      • Fabric integrity: Review the authorised WAN-edge and controller serial allowlist in Manager and set unused entries to "Invalid". Remove any unknown devices immediately.
      • IAM / least privilege: Front Manager admin access with RADIUS/TACACS+ plus MFA and reduce local accounts to a single break-glass user. Separate template-change roles and enforce four-eyes approval.
      • Configuration baseline: Export all device and feature templates, centralised and localised policies, and routing config as a known-good baseline. Automate a daily diff against the live state via the API (/dataservice/template/...).

    3. Runbook step 3

      Detection rules

      • New or unknown control peers: Parse controller syslog for control-connection up/down events and alert when the system IP or public IP is not in the CMDB. SPL shape: index=sdwan "control-connection-state-change" new-state=up | lookup sdwan_peers system_ip OUTPUT known | where isnull(known).
      • Internal account logins: Review /var/log/auth.log on controllers and the Manager audit log. Flag logins by internal high-privilege accounts from external IPs or outside maintenance windows, and successful sessions with no preceding normal authentication.
      • NETCONF sessions: Use Zeek or NetFlow to catch connections to TCP 830 from outside the management segment. Sigma shape: dst_port: 830 AND NOT src_ip|cidr: <mgmt_cidr> → level high.
      • Configuration changes: Hunt the Manager audit log for template pushes, policy activations, new local users, added SSH keys, or routing/VPN changes that have no matching change ticket.
      • Host post-exploitation: Watch for unexpected child processes of controller services (shells, curl/wget, reverse tunnels), new cron jobs, and modified files under /home or /etc. Use integrity checks such as AIDE or a comparison against the golden image.

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root&nbsp;user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.&nbsp;

    Source: pwn.watch, certeu_advisory, cisco_csaf, CSA/SingCERT, NCSC NZ (CC BY 4.0), cvelistv5, CISA KEV Catalog, NVD (NIST), CVE.org (MITRE)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    CiscoCisco Catalyst SD-WAN Manager
    • 20.9.3.0.24
    • 20.18.1_LI_Images
    • 20.11.1.2
    • 20.3.5.0.7
    • 20.3.4.0.9
    • 20.9.3.0.23
    • 18.3.1
    • 20.12.5_LI_Images
    • 20.6.6
    • 20.6.5.1.3
    • 20.9.2.0.01
    • 20.9.3.0.18
    • 20.9.3.0.3
    • 20.5.1.0.2
    • 20.6.7
    • 20.6.5.1
    • 20.3.8
    • 20.12.401
    • 20.15.1
    • 18.4.0
    • 20.6.3.0.46
    • 20.3.6
    • 20.3.4.0.11
    • 20.12.4.0.4
    • 20.9.5_LI_Images
    • 20.3.3
    • 20.3.4.1.2
    • 20.3.5.0.8
    • 20.6.5.1.13
    • 19.0.0
    • 20.12.5.2
    • 20.9.7_LI _Images
    • 20.6.3.0.38
    • 20.9.3.2_LI_Images
    • 20.3.2_928
    • 20.9.4.1.1
    • 20.9.7.1
    • 20.12.3
    • 20.1.1.1
    • 20.9.5.2.1
    • 20.4.2.2.4
    • 20.12.1_LI_Images
    • 20.6.2.2.4
    • 20.15.3.1
    • 20.6.4.0.19
    • 20.6.2.0.4
    • 20.3.3.2
    • 20.4.1.0.01
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-287Improper Authentication

      Class

      When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

      Entry at MITRE CWE-287

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    CISA KEV CatalogCISA Known Exploited Vulnerability (opens in a new tab)cisa.govactively exploited
    CSA/SingCERTActive Exploitation of Critical Vulnerability in Cisco Catalyst SD-WAN (opens in a new tab)CSA/SingCERTactively exploited
    ANSSI / CERT-FRLicence Ouverte 2.0, as of CERTFR-2026-ALE-002 – [MàJ] Vulnérabilité dans Cisco Catalyst SD-WAN (clôturée 2026-03-26) (opens in a new tab)cert.cyber.gouv.fractively exploited
    PoC-in-GitHub (nomi-sec)CVE-2026-20127 (opens in a new tab)github.comPoC (publicly reported)reported, not verified

    References & sources

    • sec.cloudapps.cisco.comcisco-sa-sdwan-rpa-EHchtZkpwn-watch
    • cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127government-resource
    • cert.atCERT.at: Kritische Sicherheitslücken in Cisco Catalyst SD-WAN - aktiv ausgenutzt - Updates verfügbarcert-at
    • cert.cyber.gouv.frANSSI / CERT-FR: CERTFR-2026-ALE-002 – [MàJ] Vulnérabilité dans Cisco Catalyst SD-WAN (clôturée 2026-03-26)cert-fr
    • pwn.watchpwn.watch: Cisco Catalyst SD-WAN Controller and Manager: Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerabilitypwn-watch
    • NVD (NIST)NVD: CVE-2026-20127pwn-watch
    • cisa.govCISA Known Exploited Vulnerabilities Catalogpwn-watch
    • pwn.watchpwn.watch: KeyDrift malware steals SD-WAN encryption keys from Cisco Catalyst SD-WAN controllers hacked through CVE-2026-20127pwn-watch
    • blog.talosintelligence.comInside KeyDrift: Analyzing historical UAT-11473 activity on Cisco SD-WANpwn-watch
    • thehackernews.comHackers Exploited Cisco SD-WAN Flaw to Plant Malware Built to Steal Encryption Keyspwn-watch

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCisco

      Description added or changed

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionchanged
      A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root&nbsp;user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.&nbsp;
      A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root&nbsp;user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.&nbsp;

      Source identifier: psirt@cisco.com

    Linked advisories

    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-20127
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-20127"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-20127.svg?lang=en" alt="CVE-2026-20127 – NEOSEC Intel" height="20"></a>