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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之前版本存在加密问题漏洞，该漏洞源于在X.509验证期间接受格式错误的RSA/PKCS#1 v1.5签名，且信任库包含e=3的根CA，导致攻击者控制或重定向RouterOS出站TLS连接后，无需私钥即可使用根证书的公钥伪造受信任的中间证书，为任意主机名颁发证书，从而实现TLS服务

CVSS 6.3 · Medium EPSS 0.25% · P16

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mikrotik RouterOS 7.24< 7.24.3 affected
7.0.0< 7.23.6 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 across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. 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. The same permissive verification also undermines RSA-based SSH authentication. This issue affects only 7.x branch was fixed in versions: 7.23.6 (Long-term) and 7.24.3 (Stable). Releases 7.23.4 and 7.24.2 included an incomplete fix.
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
Vulnerability Title
MikroTik routeros 加密问题漏洞
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之前版本存在加密问题漏洞，该漏洞源于在X.509验证期间接受格式错误的RSA/PKCS#1 v1.5签名，且信任库包含e=3的根CA，导致攻击者控制或重定向RouterOS出站TLS连接后，无需私钥即可使用根证书的公钥伪造受信任的中间证书，为任意主机名颁发证书，从而实现TLS服务
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 ~ 7.24.3 -

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 (5)

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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