by Kastro
Paper/Archive/CVE-2025-15346

CVE-2025-15346

wolfSSL wolfSSL-py — wolfSSL Python library `CERT_REQUIRED` mode fails to enforce client certificate requirement

EPSS 0.3%CVSS 9.3
critical.is priorityof 100
33
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 26.8.268 × 205.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
wolfSSL-py5.3.0 – 5.8.2–CNA

Scores by source

wolfSSL (CNA)9.3CVSS: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
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/wolfSSL/wolfssl-py/pull/62refgithub.com/wolfSSL/wolfssl-py/commit/b4517dece79f682a8f453abce5cfc0b81bae769drefgithub.com/wolfSSL/wolfssl-py/releases/tag/v5.8.4-stable