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

Quick assessment

Affected
Mikrotik RouterOS
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik routeros 6.0.0版本至6.49.21之前版本、7.0.0版本至7.23.4之前版本和7.24版本至7.24.2之前版本存在处理逻辑错误漏洞，该漏洞源于SSH在客户端请求重新协商后未经过用户身份验证即进入连接协议，可能导致未经身份验证的攻击者打开会话通道并发送exec请求，进而创建、覆盖和重建RouterOS管理文件命名空间中的文件，包括配置和诊断数据。

CVSS 6.9 · Medium KEV EPSS 1.05% · P64

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
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I. Basic Information for CVE-2026-67279

Vulnerability Information
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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
Vulnerability Title
MikroTik routeros 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik routeros 6.0.0版本至6.49.21之前版本、7.0.0版本至7.23.4之前版本和7.24版本至7.24.2之前版本存在处理逻辑错误漏洞，该漏洞源于SSH在客户端请求重新协商后未经过用户身份验证即进入连接协议，可能导致未经身份验证的攻击者打开会话通道并发送exec请求，进而创建、覆盖和重建RouterOS管理文件命名空间中的文件，包括配置和诊断数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-67279

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III. Intelligence Information for CVE-2026-67279

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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

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