CVE-2026-67279
SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
- Published
- Sep 5, 2026
- Updated
- Sep 26, 2026
- Assigning CNA
- CERT-PL
- Evidence observed
- Sep 23, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 62.9%
- Model date
- Oct 15, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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)
Sources
Python proof-of-concept scripts for the MikroTrick MikroTik RouterOS SSH takeover chain (CVE-2026-67279, CVE-2026-86060, CVE-2026-67276) for authorized lab testing.
- MicroTrickPoC
Self-contained Python PoC exploiting the MikroTrick SSH chain (CVE-2026-86060, CVE-2026-67279) to gain unauthenticated full admin access on MikroTik RouterOS devices.
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