Intel

CVE-2026-56719

RouterOS: Out-of-bounds Read (CVE-2026-56719)

mediumEPSS 0.4%

Description

MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.

Source: BSI CSAFBSI WID Portalcvelistv5NVD (NIST)

Affected products

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

MikroTikRouterOS
< 7.24fixed in 7.24

Metrics

XIEM Effective CVSS
6.5
Source: nvd-v3
EPSS percentile
31.4 %
Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
—
Show all metrics
Severity
medium
Priority score
70.39
Exploit maturity
no public PoC known
CVSS v3
6.5
CVSS v4
6.3
EPSS score
0.4 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-09-16 13:07 UTC
CWE
CWE-125

Weakness classes (CWE)

  • CWE-125Base

    Out-of-bounds Read

    The product reads data past the end, or before the beginning, of the intended buffer.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Modified2026-09-16 16:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-56719","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  2. New CVE Received2026-09-16 14:17 UTC· disclosure@vulncheck.com
    • Description: MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.
    • CVSS V4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
    • CWE: CWE-125