# CVE-2026-67279

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

- Page: https://www.vulneraibility.com/cve/CVE-2026-67279
- CVSS: 6.5
- Known exploited: yes, in CISA KEV since 2026-09-25; CISA due date 2026-09-28
- EPSS: 2.28%
- Unvetted proof-of-concept code on GitHub: 4 GitHub proofs of concept (first 2026-09-26)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2026-09-25)
- Weakness: CWE-841
- Published: 2026-09-05

## Affected versions

- Mikrotik RouterOS: affected >= 7.24 and < 7.24.2; >= 7.0.0 and < 7.23.4; >= 6.0.0 and < 6.49.21

A version outside these ranges is not a statement that it is unaffected.

## References

- [advisory] https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
- [other] https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
- [exploit] https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/
- [advisory] https://mikrotik.com/supportsec/september-2026-vulnerability/
- [other] https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
- [other] https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
- [other] https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
- [advisory] https://bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67279

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.