CVE-2026-67276: CWE-347 Improper verification of cryptographic signature in Mikrotik RouterOS
Description
RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)
CVSS v4.0
Score 9.2critical
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Nationaal Cyber Security Centrum has published an advisory (NCSC-2026-0345) reporting multiple vulnerabilities in MikroTik RouterOS, identified by CVE-2026-67276, CVE-2026-86060, and CVE-2026-67277. These vulnerabilities relate to issues classified under CWE-347 (Improper Verification of Cryptographic Signature), CWE-88 (Argument Injection or Modification), and CWE-306 (Missing Authentication for Critical Function). The advisory does not specify affected versions or provide patch links. No CVSS scores are available, and no known exploits have been reported in the wild.
Potential Impact
The vulnerabilities potentially affect the security of MikroTik RouterOS devices by allowing improper verification of cryptographic signatures, argument injection, or missing authentication for critical functions. Without detailed impact descriptions or exploitation reports, the precise consequences remain unspecified. No active exploitation is currently known.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory (NCSC-2026-0345) for current remediation guidance. Since no patch links or official fix statements are provided, users should monitor the Nationaal Cyber Security Centrum and MikroTik for updates and apply any official fixes once available.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Nationaal Cyber Security Centrum
- Advisory Id
- NCSC-2026-0345
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-86060","CVE-2026-67277"]
- State
- PUBLISHED
Threat ID: 6aa005a8acd9273b49ab4628
Added to database: 09/08/2026, 12:55:04 UTC
Last enriched: 09/08/2026, 12:57:35 UTC
Last updated: 10/22/2026, 13:15:23 UTC
Views: 62
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