Vulnerability · Published Sep 16, 2026 · Assigned by VulnCheck

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

Medium 6.5

In plain English

A medium-severity out-of-bounds read in RouterOS from MikroTik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 66.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
MikroTik	RouterOS	0 – through 6.49.187.0.0 – through 7.11.2

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

References

Release Notes vendor-advisory, patch
https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx third-party-advisory