TI-2026-47576 Aliases CVE-2026-67279 GHSA-pqp3-gjgf-83cf

SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

CRITICAL 88Exploited in the wildCWE-841Published 2026-09-05 · Updated 2026-09-26

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Why it matters now

Exploitation Active In CISA KEV since 2026-09-25CISA due date 2026-09-28

EPSS 0.02277 83rd 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, 6.49.21

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MikroTik	RouterOS	7.24 to before 7.24.2; 7.0.0 to before 7.23.4; 6.0.0 to before 6.49.21	7.24.2, 7.23.4, 6.49.21	Patch available	CNA

RouterOS VendorMikroTik Affected 7.24 to before 7.24.2; 7.0.0 to before 7.23.4; 6.0.0 to before 6.49.21 Fixed in 7.24.2, 7.23.4, 6.49.21 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:mikrotik:routeros::::::::	6.0 to before 6.49.21; 7.0 to before 7.23.4; 7.24 to before 7.24.2	Vulnerable	MikroTik

cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* Versions 6.0 to before 6.49.21; 7.0 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, 6.49.21

Fixed in the same release

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

Advisory · 2026-09-05
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-2026-47577 Unauthenticated file read in Mikrotik RouterOSPriority HIGH 77
Show all 6 records → Advisory →

Timeline

2026-09-25 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2026-67279
2026-10-03 Alias added: GHSA-pqp3-gjgf-83cf
2026-10-21 CISA KEV entry updated

References

Exploit 1

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

Advisory 4

Other 3

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-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
TI-2017-14215 The Mikrotik RouterOS web server allows memory corruption in releases before Stable… 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