CVE-2025-11936

5.3 MEDIUM
Published: November 21, 2025 Modified: December 03, 2025

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/wolfSSL/wolfssl
Source: facts@wolfssl.com
Product
https://github.com/wolfSSL/wolfssl/pull/9117
Source: facts@wolfssl.com
Issue Tracking Patch
https://github.com/wolfSSL/wolfssl/pull/9117
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Issue Tracking Patch

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
EPSS (Exploit Probability)
0.1%
26th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

wolfssl