What’s Vulnerable › Vulnerabilities

CVE-2026-56719: MikroTik RouterOS < 7.24 Out-of-Bounds Read via SMB1 SessionSetupAndX

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-09-24
• Weakness: CWE-125

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.

Affected products

• MikroTik RouterOS: through 6.49.18; from 7.0.0 through 7.11.2

References

• https://forum.mikrotik.com/t/7-24-stable-is-released/272381
• https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx

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