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CVE-2026-67278 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve	[email protected]	Third Party Advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/	[email protected]	MitigationThird Party Advisory
https://forum.mikrotik.com/t/7-23-6-long-term-is-released/273139	[email protected]	Release Notes
https://forum.mikrotik.com/t/7-24-3-stable-is-released/273138	[email protected]	Release Notes
https://mikrotik.com/supportsec/september-2026-vulnerability/	[email protected]	Vendor Advisory
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/	[email protected]	ExploitThird Party Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-347	Improper Verification of Cryptographic Signature	[email protected]

Affected Products

Product	Versions
mikrotik routeros	>= 7.0, < 7.23.6 >= 7.24, < 7.24.3
CPE cpe:2.3:o:mikrotik:routeros:::::::: Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Sep 25, 2026	Initial Analysis	[email protected]
Sep 17, 2026	CVE Modified	[email protected]
Sep 17, 2026	CVE Modified	[email protected]
Sep 8, 2026	CVE Modified	CISA-ADP
Sep 7, 2026	CVE Modified	[email protected]
Sep 7, 2026	CVE Modified	[email protected]
Sep 5, 2026	CVE Modified	[email protected]
Sep 5, 2026	New CVE Received	[email protected]