Skip to content
EXYS
Back to the CVEs

CVE-2026-67279

6.5, medium Known exploited

Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
6.5, medium medium CVSS v3.1
EPSS, next 30 days
1% higher than 62.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
5 Sept 2026a month ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 25 Sept 2026. US federal agencies had to remediate by 28 Sept 2026, a deadline that has passed.

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.

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)

Details

Vendor
MikroTik
Product
RouterOS
Weakness
CWE-841 (opens in a new tab)
Status
Analyzed
Updated
26 Sept 2026
Assigner
cvd@cert.pl

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References 9

Exploit code 1

Advisories 4

Other references 4

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other MikroTik CVEs

Every MikroTik CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-67277 MikroTik RouterOS Missing Authentication for Critical Function Vulnerability KEV EPSS 2% 8.2, high
  • CVE-2026-86060 MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability KEV EPSS 6% 9.8, critical
  • CVE-2018-14847 MikroTik Router OS Directory Traversal Vulnerability KEV EPSS 96% 9.1, critical
  • CVE-2018-7445 MikroTik RouterOS Stack-Based Buffer Overflow Vulnerability KEV EPSS 61% 9.8, critical
  • CVE-2026-67278 MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and… EPSS 0.3% 9.1, critical
  • CVE-2026-67276 RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking… EPSS 6% 8.1, high
  • CVE-2026-67281 Mikrotik RouterOS Path Traversal Vulnerability EPSS 0.7% 7.5, high

Beyond this page

Is CVE-2026-67279 in your network?

This page tells you how dangerous CVE-2026-67279 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-67279 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-67279 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.