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CVE-2026-67278

TLS server impersonation possible in Mikrotik RouterOS

Published: Sep 5, 2026Updated: Sep 17, 2026 Sources: CVE List NVDCWE-347
N/ACVSS
NVD MITRE
EPSS Score
0.2%
Top 92.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

Weaknesses

CWE-347

Affected Products

Mikrotik
commercial·LVaka routeros, winbox
RouterOSOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

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/
cert.pl
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/
npratley.net
and 3 more references View all →
News mentions
2

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