CVE-2026-67277
MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
MikroTik RouterOSNetwork & edge
CVSS
8.8HighExploit odds (EPSS)1.56%Chance of exploitation activity in the next 30 days, higher than 75% of CVEs. Scored 23 Oct 2026FIRST EPSS
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
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
- mikrotik.com/supportsec/september-2026-vulnerability/Advisoryvia CVE List
- cert.pl/en/posts/2026/09/mikrotik-routeros-cveAdvisoryvia CVE List
- cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/Advisoryvia CVE List
- npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/Exploitvia CVE List
- nvd.nist.gov/vuln/detail/CVE-2026-67277Referencevia CISA KEV
- forum.mikrotik.com/t/6-49-21-long-term-is-released/272802Referencevia CVE List
- forum.mikrotik.com/t/7-23-4-long-term-is-released/272801Referencevia CVE List
- forum.mikrotik.com/t/7-24-2-stable-is-released/272800Referencevia CVE List
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277Referencevia CVE List