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CVE-2026-67278

critical CVSS 9.1 EPSS 0.3%

MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use the root’s public certificate - without its private key - to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. The same permissive verification also undermines RSA-based SSH authentication. This issue affects only 7.x branch was fixed in versions: 7.23.6 (Long-term) and 7.24.3 (Stable). Releases 7.23.4 and 7.24.2 included an incomplete fix.

Versions it affects

Software versions checked with the free lookup that CVE-2026-67278 applies to, and the release that fixes it where the sources name one.

routeros 7.23.5 fixed in 7.24.3

At a glance

Severity
Critical
CVSS base score
9.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 15% of scored vulnerabilities
Weakness
CWE-347
Published
2026-09-05
NVD CVE.org

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