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wolfssl

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.

CVE-2025-11933 is a vulnerability classified under CWE-20 (Improper Input Validation) affecting the wolfSSL library, specifically versions 5.8.2 and earlier. The issue arises in the TLS 1.3 ClientHello message parsing logic, where the CKS (Client Key Share) extension is improperly validated. The vulnerability allows a remote unauthenticated attacker to send a ClientHello message containing duplicate CKS extensions. This malformed input can cause the wolfSSL library to mishandle the message, leading to a denial-of-service (DoS) condition by crashing or hanging the TLS service. The flaw affects multiple platforms since wolfSSL is a widely used lightweight SSL/TLS library embedded in various devices and applications, including IoT devices, industrial control systems, and network appliances. The CVSS 4.0 score is 2.3, reflecting low severity due to the limited impact (availability only), no confidentiality or integrity compromise, and the requirement for some privileges (low privileges) to exploit. No user interaction is needed, and the attack vector is network-based. Currently, no public exploits or patches are available, but the vulnerability is publicly disclosed and should be addressed promptly. The root cause is insufficient validation of the number of CKS extensions in the ClientHello message, violating protocol expectations and causing the TLS handshake to fail or the service to crash.

Detailed information about CVE-2025-11933: CWE-20 Improper Input Validation in wofSSL wolfSSL affecting wofSSL wolfSSL. Get real-time updates, technical details

CVE-2025-11933: CWE-20 Improper Input Validation in wofSSL wolfSSL - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-11933: CWE-20 Improper Input Validation in wofSSL wolfSSL

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