CVE-2026-67279

CVE Enrichment

CVSS: 6.9 MEDIUM
EPSS: 1.03%
EPSS Percentile: 62.62%
CISA KEV: YES — Known Exploited Vulnerability

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)

Technical Details

CVSS Version: 4.0
CNA / NVD Source: cvd@cert.pl
Published: 06-Sep-2026 03:17
Last Modified: 26-Sep-2026 11:17
EPSS Date: 2026-10-11
CWE: CWE-841

CVSS 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

CISA KEV Details

Date Added: 2026-09-25
Remediation Due: 2026-09-28
Known Ransomware Campaign 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.
Notes: https://mikrotik.com/supportsec/september-2026-vulnerability/?utm_source=chatgpt.com ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67279

Affected Products / Versions

mikrotik / routeros
Version / affected range: * · from (inclusive) 6.0 · before (exclusive) 6.49.21
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
mikrotik / routeros
Version / affected range: * · from (inclusive) 7.0 · before (exclusive) 7.23.4
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
mikrotik / routeros
Version / affected range: * · from (inclusive) 7.24 · before (exclusive) 7.24.2
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*

References

Last enrichment sync: 12-Oct-2026 17:48
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (2)

CVE-2026-67279 Recorded Future Reports 94 High-Impact Vulnerabilities in September 2026, Including 80 Actively Exploited
CVE-2026-67279 Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability CISA Adds Two Actively Exploited Vulnerabilities to KEV Catalog

CVE (76)

Malware (6)

Threat Actors (8)

Vendors (11)

Products (69)

Tools (7)

Industries (1)

Countries (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.