CVE-2026-67279 — Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented mitigation — cert.pl (NIST National Vulnerability Database)

CISA required action CISA

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.

US federal deadline: Sep 28, 2026 — passed 18 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Mikrotik Routeros).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
4. Apply the documented mitigations until a definitive fix is available.
5. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-841

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 1.03%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Hunt retroactively in logs from before Sep 25, 2026 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · mikrotik/routeros
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · mikrotik/routeros
  Oct 13, 2026 · NIST National Vulnerability Database
• CVSS changed · 6.5
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Added to CISA KEV catalog
  Sep 24, 2026 · CISA
• CVE published
  Sep 5, 2026 · CERT-PL

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

14 on the record

• mikrotik.com/supportsec/september-2026-vulnerability/
  Vendor Advisory, vendor-advisory, NIST National Vulnerability Database
• cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploi
  Mitigation, Third Party Advisory, technical-description, NIST National Vulnerability Database
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  US Government Resource, NIST National Vulnerability Database
• mikrotik.com/supportsec/september-2026-vulnerability
  GitHub Security Advisories
• forum.mikrotik.com/t/7-24-2-stable-is-released/272800
  Release Notes, release-notes, NIST National Vulnerability Database
• github.com/advisories/GHSA-pqp3-gjgf-83cf
  GitHub Security Advisories
• npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt
  GitHub Security Advisories
• forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
  Release Notes, release-notes, NIST National Vulnerability Database
• cert.pl/en/posts/2026/09/mikrotik-routeros-cve
  Third Party Advisory, third-party-advisory, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2026-67279
  GitHub Security Advisories
• forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
  Release Notes, release-notes, NIST National Vulnerability Database
• bishopfox.com/blog/mikrotrick-inside-the-routeros-takeover-chain
  Third Party Advisory, NIST National Vulnerability Database
• cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploi
  GitHub Security Advisories
• npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt
  Exploit, Third Party Advisory, exploit, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-103903 MikroTik RouterOS WinBox split-principal authentication bypass allows privilege escalation 3d
• Critical CVE-2026-84411 MikroTik RouterOS Integer Underflow 13d
• High CVE-2026-93345 MikroTik RouterOS < 7.25beta4 Improper Input Validation DoS via BGP Labelled-VPN NLRI 23d
• High CVE-2026-89028 MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX 29d
• Medium CVE-2026-56719 MikroTik RouterOS < 7.24 Out-of-Bounds Read via SMB1 SessionSetupAndX 29d
• Medium CVE-2026-89021 MikroTik RouterOS Path Traversal via Container OCI/tar Image Extraction Sep 14, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-67279 is "Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability", rated Medium. It affects Routeros (Mikrotik); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 6.5 describes technical severity. EPSS 1.03% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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