Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-67279— SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

Quick assessment

Affected
Mikrotik RouterOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 RouterOS 中，当客户端发起重新密钥交换（rekey）后，服务器会进入 SSH 连接协议阶段，即使从未尝试进行用户身份验证。这使得未认证的客户端能够打开会话通道并发送 exec 请求。在受影响的版本中，服务器会执行该命令，从而允许未认证的用户在 RouterOS 管理的文件命名空间中创建、覆盖和重建文件，其中包括包含配置和诊断数据的支持文件。 该问题已在以下版本中修复： 6.49.21（长期支持版，Long-term） 7.23.4（长期支持版，Long-term） 7.24.2（稳定版，Stable）

CVSS 6.9 · Medium EPSS 0.45% · P37

Affected Version Matrix 3

VendorProduct Version RangeStatus
Mikrotik RouterOS 7.24< 7.24.2 affected
7.0.0< 7.23.4 affected
6.0.0< 6.49.21 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-67279

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
Source: CVE Program / CVE List V5
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)
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
行为工作流的不恰当实施
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mikrotik RouterOS 7.24 ~ 7.24.2 -

II. Public POCs for CVE-2026-67279

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-67279

请登录查看更多情报信息。

Security Blog Posts for CVE-2026-67279 (3)

Vendor Pages for CVE-2026-67279 (4)

Same Patch Batch · Mikrotik · 2026-09-05 · 6 CVEs total

CVE-2026-86060 9.2 CRITICAL SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
CVE-2026-67276 9.2 CRITICAL SSH user impersonation possible in Mikrotik RouterOS
CVE-2026-67277 8.8 HIGH Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
CVE-2026-67281 8.7 HIGH Unauthenticated file read in Mikrotik RouterOS
CVE-2026-67278 6.3 MEDIUM TLS server impersonation possible in Mikrotik RouterOS

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: Mikrotik
Same weakness: CWE-841

V. Comments for CVE-2026-67279

No comments yet

Leave a comment