Detections
Analytics

MikroTik RouterOS Improper Enforcement of Behavioral Workflow (CVE-2026-67279)

medium Tenable OT Security Plugin ID 506132

Synopsis

The remote OT asset is affected by a 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)

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

See Also

https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve

https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802

https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801

https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800

https://mikrotik.com/supportsec/september-2026-vulnerability/

http://www.nessus.org/u?1fe530bb

http://www.nessus.org/u?6fc96c6a

http://www.nessus.org/u?b2eefc92

http://www.nessus.org/u?eed3942f

Plugin Details

Severity: Medium

ID: 506132

File Name: tenable_ot_mikrotik_CVE-2026-67279.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 10/6/2026

Updated: 10/6/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.4

Percentile: 96.46

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-67279

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:A

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

Vulnerability Information

CPE: cpe:/o:mikrotik:routeros:6, cpe:/o:mikrotik:routeros:7

Required KB Items: Tenable.ot/MikroTik

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/5/2026

Vulnerability Publication Date: 9/5/2026

CISA Known Exploited Vulnerability Due Dates: 9/28/2026

Reference Information

CVE: CVE-2026-67279

CWE: 841