6.9
Medium
CVE-2026-67279 Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware campaigns
Not observed so far
Weakness
CWE-841
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)
Affected products and versions
Other CVEs of RouterOS
The 26 CVEs of RouterOS →
CVE-2026-89035
MikroTik RouterOS through 7.24.5 contains a session token replay vulnerability in the WebFig interface that allows…
9.1
Critical
CVE-2026-112158
A weakness has been identified in MikroTik RouterOS up to 6.40.5/6.44/7.20.8
7.1
High
CVE-2026-103903
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remote…
8.7
High
CVE-2026-84411
The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling…
9.8
Critical