CISA Adds MikroTik RouterOS SSH Bypass to KEV
Tech GuruQuick Answer
The authority published CISA KEV: CVE-2026-67279 for MikroTik RouterOS 6.x and 7.x releases in the CERT Polska CNA record. CISA added the SSH pre-authentication rekey state bypass to KEV on September 25 and requires federal remediation by September 28. The CNA record provides exact affected ranges and fixed releases; the linked MikroTik advisory also instructs administrators to restrict untrusted SSH access, upgrade, review Flagged status, and inspect configuration for unknown changes. Affected deployments should be matched to the authority's exact scope and moved to the supported fixed release.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory MikroTik RouterOS 6.x and 7.x releases in the CERT Polska CNA record, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-09-26 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | MikroTik RouterOS 6.x and 7.x releases in the CERT Polska CNA record |
|---|---|
| Advisory | CISA KEV: CVE-2026-67279 |
| CVE | CVE-2026-67279 |
| Authoritative release date | 2026-09-25 14:39:25.365400 UTC |
| Authority revision date | 2026-09-25 15:41:23.920 UTC |
| Affected versions | RouterOS 6.0.0 before 6.49.21, 7.0.0 before 7.23.4, and the 7.24 branch before 7.24.2; the CNA record marks other versions unaffected by default. |
| Fixed version | RouterOS 6.49.21, 7.23.4, or 7.24.2 and later supported releases as applicable |
| CVSS base score | 6.9 (official CVSS v4.0) |
| CVSS severity | Medium |
| Exploitation status | Known exploited: CISA added CVE-2026-67279 to KEV on 2026-09-25; known ransomware campaign use is Unknown; no exploitation claim is inferred. |
What Changed
CISA added the SSH pre-authentication rekey state bypass to KEV on September 25 and requires federal remediation by September 28. The CNA record provides exact affected ranges and fixed releases; the linked MikroTik advisory also instructs administrators to restrict untrusted SSH access, upgrade, review Flagged status, and inspect configuration for unknown changes.
What To Validate Now
- Inventory. Locate MikroTik RouterOS 6.x and 7.x releases in the CERT Polska CNA record deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: RouterOS 6.0.0 before 6.49.21, 7.0.0 before 7.23.4, and the 7.24 branch before 7.24.2; the CNA record marks other versions unaffected by default. Do not infer applicability from product family or severity alone.
- Remediate. Apply RouterOS 6.49.21, 7.23.4, or 7.24.2 and later supported releases as applicable through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Confirm the resulting version or managed-service state, exercise representative functionality and recovery paths, monitor for regressions, and document exceptions.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Use the exact supported release stream and repository. Test dependencies, clusters, integrations, and rollback before broad deployment; a CVSS rating or reachable feature is not evidence of exploitation.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
