CVE-2025-11936

Name: CVE-2025-11936
Creator: NVD / NIST
Published: 2025-11-21T23:15:44.71+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2025-11936 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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.. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 4.0

6.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.40%

31.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	>= 5.8.2, < 5.8.4

References

https://github.com/wolfSSL/wolfsslProduct
https://github.com/wolfSSL/wolfssl/pull/9117Issue Tracking, Patch
https://github.com/wolfSSL/wolfssl/pull/9117Issue Tracking, Patch

Timeline

Published: Nov 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-11936?

How severe is CVE-2025-11936?

CVE-2025-11936 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2025-11936?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-11936?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST