Medium severity · published Sep 16, 2026
CVE-2026-56719
MikroTik RouterOS < 7.24 Out-of-Bounds Read via SMB1 SessionSetupAndX
6.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RO
RouterOS · MikroTik
through 6.49.18; 7.0.0 through 7.11.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56719
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56719
vendor-advisory
https://forum.mikrotik.com/t/7-24-stable-is-released/272381
third-party-advisory
https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx
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