Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-67279

CVE-2026-67279MEDIUM

Mikrotik RouterOS — SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   L   L   N    6.9   .0103   62.4   YES

AFFECTED
  Product   Versions  Fixed
  RouterOS  7.24 –    —

TIMELINE
  Jul 29  Reserved by CERT-PL
  Sep 5   Published (CNA: CERT-PL)
  Sep 8   EXPLOIT PUBLISHED — CVE-2026-67279 (Mikrotik RouterOS). Public exploit reference added.
  Sep 25  EXPLOIT PUBLISHED — CVE-2026-67279 (Mikrotik RouterOS). Public exploit reference added.
  Sep 25  ADDED TO KEV — CVE-2026-67279 (Mikrotik RouterOS). Remediation due September 28, 2026.
  Sep 29  DUE DATE PASSED — CVE-2026-67279 (Mikrotik RouterOS). CISA remediation deadline was September 28, 2026; still in catalog.

CWE-841 · CNA: CERT-PL · CVSS v4.0 · 9 references · NVD status: Analyzed · KEV due September 28, 2026

Description

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)

Lifecycle

Complete event history — 6 events, chronological
Date	Event	Detail
July 29, 2026	Reserved	Reserved by CERT-PL
September 5, 2026	Published	Published (CNA: CERT-PL)
September 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67279 (Mikrotik RouterOS). Public exploit reference added.
September 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67279 (Mikrotik RouterOS). Public exploit reference added.
September 25, 2026	KEV ADDED	ADDED TO KEV — CVE-2026-67279 (Mikrotik RouterOS). Remediation due September 28, 2026.
September 29, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2026-67279 (Mikrotik RouterOS). CISA remediation deadline was September 28, 2026; still in catalog.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Mikrotik	RouterOS	—	7.24	—

Weaknesses

CWE-841

References (9)

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

Authoritative record: CVE-2026-67279 at cve.org

Vendors: mikrotik

Weaknesses: CWE-841

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67279 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.