CVE-2026-67278
TLS server impersonation possible in Mikrotik RouterOS
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. 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. This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)
| CWE | CWE-347 |
| Vendor | mikrotik |
| Product | routeros |
| Published | Sep 5, 2026 |
| Last Updated | Sep 8, 2026 |
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Affected Versions
Mikrotik / RouterOS
7.24 < 7.24.2 7.0.0 < 7.23.4
References
cert.pl: https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve cert.pl: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ npratley.net: https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ mikrotik.com: https://mikrotik.com/supportsec/september-2026-vulnerability/ forum.mikrotik.com: https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 forum.mikrotik.com: https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
Credits
Sławomir Rozbicki (CERT.PL)