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CVE-2026-67278— TLS server impersonation possible 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.

MikroTik RouterOS 在 X.509 证书验证过程中会接受格式错误的 RSA/PKCS#1 v1.5 签名。由于其信任存储区中包含一个使用 e=3 的根 CA，控制或重定向出站 RouterOS TLS 连接的攻击者可以利用该根 CA 的公钥证书（无需私钥）伪造可信的中间 CA 并为任意主机名颁发证书，从而实现 TLS 服务器冒充。 该问题在以下版本中已修复：6.49.21（长期支持版）、7.23.4（长期支持版）和 7.24.2（稳定版）。

CVSS 6.3 · Medium EPSS 0.17% · P6

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-2026-67278

Vulnerability Information
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Vulnerability Title
TLS server impersonation possible in Mikrotik RouterOS
Source: CVE Program / CVE List V5
Vulnerability Description
MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use the root’s public certificate - without its private key - to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. 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:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
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-2026-67278

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III. Intelligence Information for CVE-2026-67278

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Security Blog Posts for CVE-2026-67278 (3)

Vendor Pages for CVE-2026-67278 (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-2026-67279 6.9 MEDIUM SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: Mikrotik
Same weakness: CWE-347

V. Comments for CVE-2026-67278

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