Out-of-bounds Read in Mikrotik Routeros
CVE-2026-56719
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- forum.mikrotik.com/t/7-24-stable-is-released/272381 (vendor-advisory, patch)
- www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sess… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56719?
- CVE-2026-56719 is a medium-severity vulnerability in Mikrotik Routeros, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-09-16.
- How severe is CVE-2026-56719?
- Medium severity. CVSS v3 base score is 6.5 out of 10.