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TI-2026-47573 Aliases CVE-2026-67276GHSA-j9wg-77fw-f22f

SSH user impersonation possible in Mikrotik RouterOS

Priority MEDIUM 53CWE-347Published · Updated

Key facts

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

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

Summary

RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.08943 95th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed RouterOS (Mikrotik): 7.24.2, 7.23.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 7.24.2; 7.9 to before 7.23.47.24.2, 7.23.4Patch availableCNA
  • RouterOS VendorMikroTik Affected 7.24 to before 7.24.2; 7.9 to before 7.23.4 Fixed in 7.24.2, 7.23.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*7.9 to before 7.23.4; 7.24 to before 7.24.2VulnerableMikroTik
  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* Versions 7.9 to before 7.23.4; 7.24 to before 7.24.2 Vulnerable ·MikroTik

Remediation

  • Fix · CNA RouterOS (Mikrotik) Fixed in 7.24.2, 7.23.4

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-2026-67276
  2. 2026-10-03 Alias added: GHSA-j9wg-77fw-f22f
  3. 2026-10-25 EPSS moved to the 95th–99th percentile

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