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CVE-2025-15346— wolfSSL Python library `CERT_REQUIRED` mode fails to enforce client certificate requirement

Quick assessment

Affected
wolfSSL wolfSSL-py
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.

wolfssl-py是wolfSSL开源的一个Python打包工具。 wolfssl-py 5.8.2及之前版本存在安全漏洞，该漏洞源于未完全强制执行客户端证书要求，可能导致身份验证不当和绕过相互TLS客户端身份验证。

AI Predicted 8.8 Difficulty: Easy EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-15346

Vulnerability Information
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Vulnerability Title
wolfSSL Python library `CERT_REQUIRED` mode fails to enforce client certificate requirement
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the handling of verify_mode = CERT_REQUIRED in the wolfssl Python package (wolfssl-py) causes client certificate requirements to not be fully enforced.  Because the WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT flag was not included, the behavior effectively matched CERT_OPTIONAL: a peer certificate was verified if presented, but connections were incorrectly authenticated when no client certificate was provided.  This results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.  The issue affects versions up to and including 5.8.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/AU:Y
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
wolfssl-py 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfssl-py是wolfSSL开源的一个Python打包工具。 wolfssl-py 5.8.2及之前版本存在安全漏洞，该漏洞源于未完全强制执行客户端证书要求，可能导致身份验证不当和绕过相互TLS客户端身份验证。
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
wolfSSL wolfSSL-py 5.3.0 ~ 5.8.2 -

II. Public POCs for CVE-2025-15346

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III. Intelligence Information for CVE-2025-15346

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Patches & Fixes for CVE-2025-15346 (2)

Other References for CVE-2025-15346 (1)

IV. Related Vulnerabilities

Same vendor: wolfSSL
Same weakness: CWE-306

V. Comments for CVE-2025-15346

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