CVE-2025-11933: wolfSSL

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Input Validation in the TLS 1.3 CKS extension parsing in wolfSSL 5.8.2 and earlier on multiple platforms allows a remote unauthenticated attacker to potentially cause a denial-of-service via a crafted ClientHello message with duplicate CKS extensions.

Affected products

• wolfSSL wolfSSL: from 5.8.2, before 5.8.4 (fixed in 5.8.4)

Published 2025-11-21. Last modified 2026-10-08.