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    CVE-2026-67278

    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.

    Published:Sep 5, 2026
    Last Modified:Sep 25, 2026
    EPS:Sep 5, 2026
    EPSS Score:0.00278
    CVSS Score:9.1

    Affected Products

    Vendor
    Mikrotik
    Product
    Routeros

    Exploits

    https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-89035 (CVSS 9.1) — MikroTik RouterOS through 7.24.5 contains a session token replay vulnerability in the WebFig interface that al…
    CVE-2026-112158 (CVSS 7.1) — A weakness has been identified in MikroTik RouterOS up to 6.40.5/6.44/7.20.8. Impacted is the function same_ch…
    CVE-2026-103903 (CVSS 8.7) — An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remot…
    CVE-2026-84411 (CVSS 9.3) — The web management service in affected RouterOS versions contains an integer underflow in its HTTP request bod…
    CVE-2026-93345 (CVSS 8.7) — MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLR…
    CVE-2026-89028 (CVSS 8.2) — MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that…
    CVE-2026-56719 (CVSS 6.3) — MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that al…
    CVE-2025-56566 (CVSS 4.6) — MikroTik firmware 7.19.4 stores sensitive authentication credentials and network state in cleartext within non…
    CVE-2026-89021 (CVSS 6.9) — MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image…
    CVE-2026-89020 (CVSS 5.3) — MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnera…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High