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CVE-2026-67277

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

MikroTik RouterOSNetwork & edge
CVSS
8.8High
ExploitationExploited in the wildAdded to KEV 10 Sep 2026CISA KEV
Exploit odds (EPSS)1.56%Chance of exploitation activity in the next 30 days, higher than 75% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in7.24.2Also 7.23.4, 6.49.21CVE List
Federal deadline13 Sep 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 5 Sep 2026, 20:00 UTCPublishedCVE List
  2. 10 Sep 2026Added to CISA KEVCISA KEV

Description

MikroTik RouterOS contains a missing authentication for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service.

Text from CVE List

Affected versions 3

  • RouterOSaffected: 7.24 before 7.24.2CVE List
  • RouterOSaffected: 7.0.0 before 7.23.4CVE List
  • RouterOSaffected: 6.0.0 before 6.49.21CVE List

References 9