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SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

MikroTik RouterOS · CVE-2026-67279
0 news outlets2 CERTs and agencies0 researchers

What is it?

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)

Evidence

CERTs and agencies (2)

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
6.9
EPSS
1.0%
First seen
4 h ago
Status
confirmed

All MikroTik vulnerabilities