---
cve: "CVE-2026-67278"
severity: "LOW"
cvss: 3.1
epss: "6%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-05 20:17:18"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T12:08:50+02:00"
---

# CVE-2026-67278

> 3.1 LOW

## Beschreibung

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 was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

## Referenzen

- <https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve>
- <https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/>
- <https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802>
- <https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801>
- <https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800>
- <https://mikrotik.com/supportsec/september-2026-vulnerability/>
- <https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67278) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_