CVE-2026-67279
Medium · CVSS 6.9Published 2026-09-05
CVSS
6.9
Medium
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-67279?
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)
CVSS Score Explained
CVSS 6.9 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
- PoChttps://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
- PATCHhttps://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
- PATCHhttps://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
- PATCHhttps://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
- ›https://mikrotik.com/supportsec/september-2026-vulnerability/
- PATCHhttps://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/
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Recent CVEs
- CVE-2026-76160Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.—
- CVE-2026-76161Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.—
- CVE-2026-86150A security vulnerability has been detected in Tenda CP3 27.5.57.101. Impacted is an unknown function of the file custom-x/softap/hostapd. Such manipulation of the argument wpa_passphrase leads to hard-coded credentials. The attack can be launched remotely. The exploit has been disclosed publicly and may be used.2.0
- CVE-2026-86148A security flaw has been discovered in Tenda CP3 27.5.57.101. This vulnerability affects the function SystemAsh of the file Apis/system.c of the component Kylin. The manipulation of the argument AlarmVoiceURL results in os command injection. It is possible to launch the attack remotely.9.4
- CVE-2026-86149A weakness has been identified in Tenda CP3 27.5.57.101. This issue affects some unknown processing of the file Net/NetCheckPing.cpp. This manipulation of the argument interface_name/host causes os command injection. The attack can be initiated remotely.9.4
- CVE-2026-67277RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.
This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)8.8