CriticalCVE-2026-20122

    Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability (CVE-2026-20122)

    Published In CISA KEV since Sources: CERT-EU, Cisco PSIRT, CVE.org, pwn.watch

    What is affected, what to do

    A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system.

    The vulnerability is being actively exploited; treat it as a priority. Update catalyst_sd-wan_manager to version 20.12.5.3. 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

    5.4

    Priority

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

    Source: NVD, CVSS v3

    5.4

    CVSS v3

    Severity Medium on the scale from 0 to 10.

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

    25.8 %

    EPSS score

    Elevated — model estimates 10-50% exploitation likelihood.

    Source: FIRST EPSS, percentile 98.0

    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
    218.46 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 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
    5.4 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
    5.4
    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
    25.8 %
    Elevated — model estimates 10-50% exploitation likelihood.
    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
    98.0
    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
    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-648

    Response and mitigation

    Why act now?

    Prioritisation rationale

    The base severity looks moderate on paper: the flaw is network-reachable with low complexity but requires authentication. However, SD-WAN Manager is the control plane for your entire WAN overlay, and vmanage privileges let an attacker alter configuration and policy for every site or chain into further privilege escalation to root. Exploitation likelihood sits among the highest of all tracked CVEs. Read-only credentials are often weakly protected and widely shared with NMS tooling, so the authentication requirement offers little real protection. CISA does not flag known ransomware use. Treat internet-exposed or broadly reachable vManage instances as top priority, patching or restricting access within 24 h. Where management access is strictly isolated, the risk remains high but can be handled in an expedited maintenance window.

    1. Runbook step 1

      Immediate response (0-24 h)

      • Inventory every instance: Identify all Cisco Catalyst SD-WAN Manager (vManage) instances, including cluster members and DR standbys, and confirm their running versions. Affected releases in the context include 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. Several of these trains are long out of support, so expect a major-version upgrade.
      • Apply the vendor fix: A patch is available from Cisco. Look up the fixed release in the Cisco Security Advisory for CVE-2026-20122. Validate the upgrade path for controllers (vSmart/vBond) and edges against the Cisco SD-WAN compatibility matrix before you start.
      • Lock down API/web access now: Block the management HTTPS interface (typically TCP 443/8443) from the internet and from general user networks. Allow access only from a dedicated admin jump host or PAW.
      • Audit read-only API accounts: Exploitation only requires valid read-only credentials with API access. Enumerate local and RADIUS/TACACS+-mapped operator/read-only users, disable anything unused, and rotate passwords and API tokens for the rest. Prioritise service accounts used by monitoring and NMS integrations.
      • Preserve evidence before patching: Take a snapshot or backup and export logs before the upgrade overwrites artefacts. Then hunt for files modified under the vmanage user context (see Detection rules).
      • If compromise is suspected: Isolate the instance at the network layer without abruptly severing overlay control, and engage Cisco TAC. Assess your NIS2 reporting obligations, which require an early warning within 24 h.

    2. Runbook step 2

      Mitigation layers

      • Network segmentation: Place SD-WAN Manager in a dedicated management VLAN/VRF and permit HTTPS only from enumerated admin source ranges. Restrict vManage egress to required destinations (controllers, NTP, syslog, Cisco cloud services) to cut off payload staging and exfiltration paths.
      • WAF/reverse proxy: If API access must remain available for automation, front it with a proxy. The proxy should reject file uploads (multipart/form-data, PUT/POST carrying file payloads) to /dataservice/ paths from anything other than approved automation hosts, and drop path-traversal sequences (../, %2e%2e%2f, ..%2f) in filenames and parameters.
      • IAM/least privilege: Remove API access from read-only roles that don't need it. Give integrations dedicated, IP-bound accounts. Centralise authentication through TACACS+/RADIUS with MFA enforced at the jump host, and disable or strongly re-credential local default accounts.
      • Configuration hardening: Shorten session timeouts, cap concurrent sessions, and forward audit logs via syslog to an off-box SIEM so an attacker with vmanage rights cannot tamper with them.
      • IPS coverage: Enable current Cisco Talos/Snort rulesets for Cisco SD-WAN on the upstream firewall. Look up the specific SIDs in the Talos ruleset rather than relying on generic web signatures.

    3. Runbook step 3

      Detection rules

      • Web/API access logs: Alert on POST/PUT file uploads to /dataservice/ endpoints by read-only accounts, and on traversal sequences in filenames. Sigma shape: selection: cs-method in (POST,PUT) AND cs-uri-stem startswith "/dataservice/" AND (cs-uri-query contains "../" OR request_body contains "filename=\"../").
      • SD-WAN Manager audit log: Flag read-only logins from unfamiliar source IPs or at unusual hours, bursty API sessions, and first-ever API use by an account that previously only logged in interactively. SPL: index=sdwan sourcetype=vmanage:audit user_role=operator action=*upload* | stats count by user, src_ip.
      • Filesystem integrity (forensic/shell access): Find recently changed files owned by vmanage, for example with find / -user vmanage -newermt "<date>" -type f 2>/dev/null. Focus on ~/.ssh/authorized_keys, cron entries, startup scripts, and web/application directories, where JSP webshells could be planted. Also review /var/log/nms/ for upload errors and stack traces.
      • Process ancestry: Treat sh, bash, curl, wget, python or nc spawned by the vManage Java application server as high-fidelity evidence of code execution following a file overwrite.
      • Network telemetry (Zeek/Suricata): Watch for new vManage egress to external IPs on non-standard ports and for large HTTP POST bodies to the management interface from non-approved sources. Zeek: filter http.log on id.resp_h == <vManage> && method == "POST" && request_body_len > 100000.

    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 API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system&nbsp;and gain vmanage user privileges.

    Source: certeu_advisory, cisco_csaf, cvelistv5, pwn.watch, NVD (NIST), CISA KEV Catalog, 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
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    Vendors and products

    Weakness classes (CWE)

    • CWE-648Incorrect Use of Privileged APIs

      Base

      The product does not conform to the API requirements for a function call that requires extra privileges. This could allow attackers to gain privileges by causing the function to be called incorrectly.

      Entry at MITRE CWE-648

    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

    References & sources

    • sec.cloudapps.cisco.comcisco-sa-sdwan-authbp-qwCX8D4vVendor advisory, pwn-watch
    • cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20122government-resource, US government resource
    • cert.atCERT.at: Kritische Sicherheitslücken in Cisco Catalyst SD-WAN - aktiv ausgenutzt - Updates verfügbarcert-at
    • pwn.watchpwn.watch: Cisco Catalyst SD-WAN Manger: Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerabilitypwn-watch
    • NVD (NIST)NVD: CVE-2026-20122pwn-watch
    • cisa.govCISA Known Exploited Vulnerabilities Catalogpwn-watch

    Linked advisories

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    <a href="https://intel.neosec.eu/en/cve/CVE-2026-20122"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-20122.svg?lang=en" alt="CVE-2026-20122 – NEOSEC Intel" height="20"></a>