CVE-2026-67279: mikrotik routeros

CVSS 6.9 (medium) · listed as exploited by CISA since 2026-09-25 · published 2026-09-05

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)

Affected products (NVD): mikrotik routeros

Fixed in (NVD): 6.49.21, 7.23.4, 7.24.2

Weakness: CWE-841

Source: NVD CVE-2026-67279

References

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

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