CVE-2026-67279
MikroTik RouterOS: Improper Enforcement of Behavioral Workflow
As of , CVE-2026-67279 in MikroTik RouterOS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.
- Exploited
- Yes: CISA listed it on 25 September 2026
- US federal deadline
- 28 September 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.01Higher than 62% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: mikrotik.comLinks below, from CISA's entry.
What CISA says to do
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.
CISA's required action
What the flaw is
Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.
CISA's 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)
The CVE record's description, from CERT-PL
- CVE published
- 5 September 2026
- Assigned by
- CERT-PL
- CVSS
- 6.9 Medium (CVSS 4.0, from the CNA)
- CWE-841
- Improper Enforcement of Behavioral Workflow
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- partial
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
RouterOS: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2026-86060Improper Neutralization of Argument Delimiters in a Command | MikroTik RouterOS | Patch nowForensic triage required by CISA | 0.06 | ||
| CVE-2018-14847Router OS Directory Traversal | MikroTik RouterOS | Patch this weekMetasploit module; EPSS 0.96 | 0.96 | ||
| CVE-2018-7445Stack-Based Buffer Overflow | MikroTik RouterOS | Patch this weekEPSS 0.61 | 0.61 | ||
| CVE-2026-67277Missing Authentication for Critical Function | MikroTik RouterOS | Patch soon | 0.02 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org