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ExploitedIn CISA KEVFix available

CVE-2026-67279

Exploitation confirmed. First attested on 2026-09-23 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · previdian.

  • Published2026-09-05
  • Fixed in7.24.2 · 7.23.4 · 6.49.21
  • WeaknessCWE-841

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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)

Timeline

dates in UTC
  1. 2026-09-0520:17CVE publishedNVD
  2. 2026-09-2317:08Listed as exploited by GCVEGCVE
  3. 2026-09-2317:08Exploitation first reportedGCVE
  4. 2026-09-25Added to the CISA KEV catalogCISA KEV
  5. 2026-09-2515:40SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Mikrotik routeros
BranchAffectedFixed in
7.24≥ 7.24, < 7.24.27.24.2
7.x≥ 7.0, < 7.23.47.23.4
6.x≥ 6.0, < 6.49.216.49.21

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As CERT-PL, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mikrotik RouterOSother versions: not affected
    Affected
    • ≥ 7.24, < 7.24.2fixed in 7.24.2custom
    • ≥ 7.0.0, < 7.23.4fixed in 7.23.4custom
    • ≥ 6.0.0, < 6.49.21fixed in 6.49.21custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-05

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sshambleopenSUSE:Tumbleweedall versions · fixed in 0.3.12-1.1

Full record on NVD

Fix

  1. Update Mikrotik routeros to 7.24.2 · 7.23.4 · 6.49.21
  2. CISA’s 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.due 2026-09-28

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-09-25
Patch Due Date
2026-09-28
Ransomware Use
Unknown
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.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 4.0 vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-09-05
Last Modified
2026-09-26
NVD status
Analyzed
GitHub Advisory
GHSA-pqp3-gjgf-83cf

Frequently asked questions

What is CVE-2026-67279?

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)

Is CVE-2026-67279 actively exploited?

Yes. CVE-2026-67279 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-09-28.

What is the CVSS score for CVE-2026-67279?

CVE-2026-67279 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

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Sources for this record