CVE-2026-67279: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability

Patch now

MEDIUM 6.5EXPLOITEDREMOTEUPGRADE

CVE-2026-67279 is a medium-severity flaw (CVSS 6.5) affecting routeros, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 dat

Why this priority

Exploited in the wild (CISA KEV)
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	Yes, fix due 2026-09-28
Weakness	CWE-841
Published	2026-09-05
Last modified	2026-09-26

Publisher (CNA): CERT.PL · Vendor: mikrotik

Am I affected?

Timeline

2026-09-05 20:17 UTCPublished CVE record published
2026-09-25Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-09-26 04:17 UTCUpdated Record last modified
2026-09-28Deadline CISA due date for US federal agencies to patch

mikrotik routeros UPGRADE

Affected: >= 6.0 and < 6.49.21 · >= 7.0 and < 7.23.4 · >= 7.24 and < 7.24.2

Fixed in: 6.49.21, 7.23.4, 7.24.2

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source

sudo dnf upgrade --advisory=FEDORA-2026-0602a84203

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: tc4dy/CVE-2026-67279-86060-Toolkit (5 stars)
GitHub PoC: HackSpeak/CVE-2026-67279 (4 stars)
GitHub PoC: shmaki4/CVE-2026-67279-Mikrotik-6.42-POC (0 stars)
Write-up: bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain
Write-up: forum.mikrotik.com/t/7-24-2-stable-is-released/272800

Advisories and coverage

Official advisories

CERT Polska: MikroTrick: technical analysis, disclosure process, and the use of LLM agents 2026-09-22
CERT Polska: Vulnerabilities in Mikrotik RouterOS software 2026-09-05

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

CVE-2026-67277 HIGH 8.2 EXPLOITED UPGRADE MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
CVE-2026-86060 CRITICAL 9.8 EXPLOITED UPGRADE MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability

References

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