CVE-2025-11933 LOW

CVE-2025-11933: DoS Vulnerability in wolfSSL TLS 1.3 CKS Extension

Vendor Wofssl
Product wolfSSL
Weakness CWE-20 · Input validation
Published November 21, 2025
Last update December 8, 2025

CVSS base score

2.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

November 21, 2025 CVE published
December 8, 2025 Record updated