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Exploited vulnerability · CISA KEV

Is CVE-2026-67279 exploited? Yes: in CISA KEV since 25 Sep 2026

Gociux · MikroTik RouterOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-67279, Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Sep 2026, 20 days after it was published. It affects MikroTik RouterOS. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 25 Sep 2026
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity6.9CVSS 4.0 · medium
US federal due28 Sep 2026BOD 22-01 deadline

What it is

Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.

VendorMikroTik (5 exploited CVEs in KEV)
ProductRouterOS
VulnerabilityMikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
WeaknessCWE-841
Published5 Sep 2026
Added to KEV25 Sep 2026
Reported by (CNA)CERT-PL

What to do

  1. Check whether you run it. Look for RouterOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited MikroTik CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Sep 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for MikroTik.

Other exploited CVEs in RouterOS

References

Questions

Is CVE-2026-67279 being exploited?

Yes. CISA added CVE-2026-67279 to the Known Exploited Vulnerabilities catalog on 25 Sep 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-67279 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-67279?

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. Check MikroTik's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected RouterOS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2026 · MikroTik scorecard · act-now radar.

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