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TI-2026-47575 Aliases CVE-2026-67278GHSA-cq44-x9vf-fpqg

TLS server impersonation possible in Mikrotik RouterOS

Priority MEDIUM 61CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00261 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed RouterOS (Mikrotik): 7.24.3, 7.23.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MikroTikRouterOS7.24 to before 7.24.3; 7.0.0 to before 7.23.67.24.3, 7.23.6Patch availableCNA
  • RouterOS VendorMikroTik Affected 7.24 to before 7.24.3; 7.0.0 to before 7.23.6 Fixed in 7.24.3, 7.23.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*7.0 to before 7.23.6; 7.24 to before 7.24.3VulnerableMikroTik
  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* Versions 7.0 to before 7.23.6; 7.24 to before 7.24.3 Vulnerable ·MikroTik

Remediation

  • Fix · CNA RouterOS (Mikrotik) Fixed in 7.24.3, 7.23.6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Mikrotik RouterOS — mikrotik.com/supportsec/september-2026-vulnerability

    6 records Highest priority Priority CRITICAL 3 CRITICAL, 1 HIGH, 2 MEDIUM

    Other records, highest priority first

    • TI-2026-58872 SSH session privilege manipulation via a crafted username in Mikrotik RouterOSPriority CRITICAL 99
    • TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest servicePriority CRITICAL 95
    • TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOSPriority CRITICAL 88
    Show all 6 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67278
  2. 2026-10-03 Alias added: GHSA-cq44-x9vf-fpqg

References

Exploit 1

Advisory 3

Other 2

  • TI-2018-05369 A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-58872 SSH session privilege manipulation via a crafted username in Mikrotik RouterOS KEVCVSS 4.0CRITICAL 9.2
  • TI-2018-10669 MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary… KEVCVSS 3.1CRITICAL 9.1
  • TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest service KEVCVSS 4.0HIGH 8.8
  • TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS KEVCVSS 4.0MEDIUM 6.9
  • TI-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences