CVE-2026-67279 - RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never att
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)
CRITICAL
CISA KEV
ACTIVELY EXPLOITED
Severity & confidence
Source severityinformational
Platform severitycritical
Confidencehigh
Exploitationactively exploited
CVSS-
Affected
ProductsRouterOS
Reporting sources (2)
NIST NVD - National Vulnerability Database
CISA - Known Exploited Vulnerabilities
🎯 Why should I care?
- On the CISA Known Exploited Vulnerabilities list.
- Credible sources report active exploitation in the wild.
Timeline & provenance
Published2026-09-05T20:17:18
Last updated2026-10-21T04:58:06
Ingested2026-09-07T15:27:26
FreshnessNEAR-REAL-TIME
Threat typevulnerability
Recommended action
No recommended action published with this item - review the original source.
Next steps
- Identify affected systems in your environment.
- Apply the vendor patch or mitigation guidance.
- Review logs for indicators described in the advisory.
- Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: standards · Original: NIST NVD - National Vulnerability Database
