CVE-2025-11936

MEDIUM

wolfssl 5.8.2-5.8.3 - Unauthenticated Denial of Service via TLS 1.3 KeyShareEntry Parsing

Title source: llm
STIX 2.1

Description

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

References (2)

Core 2

Scores

CVSS v3 5.3
EPSS 0.0040
EPSS Percentile 31.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (1)
wolfssl/wolfssl 5.8.2 - 5.8.4
Published Nov 21, 2025
Tracked Since Feb 18, 2026