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CVE-2026-67278

TLS server impersonation possible in Mikrotik RouterOS

CVSS 4.0 6.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-67278

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-67278

Published

RouterOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Mikrotik",
                    "product": "RouterOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "7.24",
                            "lessThan": "7.24.3",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "7.0.0",
                            "lessThan": "7.23.6",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON