CVE-2026-67278

Katalog CVE

CVSS 9.1 · Critical EPSS 0,25%

Kerentanan Improper Verification of Cryptographic Signature pada mikrotik routeros. Skor CVSS 3.1 9.1 (Critical) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

5 September 2026

Terakhir diubah

25 September 2026

Status NVD

Analyzed

CVSS 3.1

9.1 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-347: Improper Verification of Cryptographic Signature

EPSS (30 hari)

0,25% peluang dieksploitasi; lebih tinggi dari 15,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://mikrotik.com/supportsec/september-2026-vulnerability/ advisory vendor
• https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ mitigasi · advisory pihak ketiga
• https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve advisory pihak ketiga
• https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit · advisory pihak ketiga
• https://forum.mikrotik.com/t/7-23-6-long-term-is-released/273139 release notes
• https://forum.mikrotik.com/t/7-24-3-stable-is-released/273138 release notes