CVE-2025-11936 — Improper Input Validation in Wolfssl

CWE-20 — Improper Input Validation5 documents5 sources
Severity
6.3MEDIUMNVD
EPSS
0.0%
top 91.10%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
WolfsslDebian WolfsslMsrc Azl3 Mariadb 10.11.11-1 ON Azure Linux 3.0+1 more
Timeline
PublishedNov 21
Latest updateNov 22

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.

CVSS vector

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

Affected Packages6 packages

▶debiandebian/wolfssl< wolfssl 5.8.4-1 (forky)
▶CVEListV5wolfssl/wolfssl3.12.0 — 5.8.4
▶NVDwolfssl/wolfssl5.8.2 — 5.8.4
▶Debianwolfssl/wolfssl< 5.8.4-1

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-2mmq-prpj-ww9q: Improper input validation in the TLS 1↗2025-11-22
▶
OSV
CVE-2025-11936: Improper input validation in the TLS 1↗2025-11-21
▶

📋Vendor Advisories

2
Microsoft
Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello↗2025-11-11
▶
Debian
CVE-2025-11936: wolfssl - Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2...↗2025
▶
CVE-2025-11936 — Improper Input Validation in Wolfssl | cvebase