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Vulnerability Intelligence

CVE-2026-67279

MediumExploitedPublic exploit

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.

Published Sep 5, 2026 · Updated Sep 26, 2026 · Also known as EUVD-2026-72027, GHSA-pqp3-gjgf-83cf

Key Facts

Patch immediately
  • CVE-2026-67279 is a medium-severity vulnerability (CVSS 6.9 v4) affecting RouterOS (Mikrotik), sshamble (suse).
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 5, 2026. Public exploit code is available.
  • EPSS estimates a 1.0% probability of exploitation in the next 30 days.
  • Fixed versions are available, including RouterOS 6.49.21, RouterOS 7.23.4, RouterOS 7.24.2.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

6.9

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS (30-day exploit likelihood)

1.0%

Higher than 63.0% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

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Description

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)

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVSep 25, 2026Sep 28, 2026Not reported
Industry KEV feedSep 5, 2026Sep 28, 2026Not reported
CIRCL KEVSep 23, 2026Sep 28, 2026Not reported
ENISA EUVDSep 25, 2026n/aNot reported

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Products

5 affected entries in total
ProductAffected versionsFixed in
RouterOSMikrotik>= 7.247.25.1
sshamblesuseSee advisory0.3.12-1.1

Patched Releases

RouterOS

6.49.21, 7.23.4, 7.24.2, 7.25.1

sshamble

0.3.12-1.1

Timeline

  1. Publicly disclosed

    Sep 5, 2026

  2. Added to Industry KEV feed

    Sep 5, 2026

  3. Added to CIRCL KEV

    Sep 23, 2026

  4. Added to CISA KEV

    Sep 25, 2026

  5. Added to ENISA EUVD

    Sep 25, 2026

  6. Last updated

    Sep 26, 2026

Weakness Type

  • CWE-841 Improper Enforcement of Behavioral Workflow

References

6 more references in the full CVE brief

FAQ

Common Questions.

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