CVE-2026-67279 — Mikrotik RouterOS

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)

The record classifies CVE-2026-67279 under weakness class CWE-841. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 58 days ago.

Severity and exploitation probability

CVSS v4.0 base score: 6.9 — Medium (derived from score)
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
EPSS (FIRST): 0.4% probability of exploitation in the next 30 days, higher than 37.3% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 6.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-09-05

Is CVE-2026-67279 being exploited?

Weaponised exploit code for CVE-2026-67279 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.

trickest/cve (trickest)

Affected products and versions

Mikrotik: RouterOS

How to fix CVE-2026-67279

No vendor patch reference has been recorded for CVE-2026-67279 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-67279

3 tracked threats in the Threadlinqs corpus reference CVE-2026-67279, either in the campaign’s CVE list or as an indicator on the campaign record.

CISA Adds Two Actively Exploited KEVs: SharePoint Code Injection (CVE-2026-65660) and Mikrotik RouterOS Auth Bypass (CVE-2026-67279) — CRITICAL · 2026-09-26
CISA Adds Actively Exploited WSO2 API Manager and Adobe Commerce Flaws to KEV Catalog, Warns on SharePoint Code Injection — CRITICAL · 2026-09-25
Attackers Hijack MikroTik Routers Through Internet-Exposed SSH Without Authentication (MikroTrick) — CRITICAL · 2026-09-06

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-06. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch