CVE-2026-67279

What is 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)

Timeline

• 2026-09-05Published to the U.S. National Vulnerability Database (NVD)
• 2026-09-08NVD record last updated
• 2026-09-24First covered in a defend.network daily briefing

Affected product

See advisory

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://nvd.nist.gov/vuln/detail/CVE-2026-67279

Referenced in our briefings & reports

• Check Point RCE, MikroTik SSH chain, malicious npm/Terraform packages in active exploitation (2026-09-24)