What is CVE-2025-11936?

CVE-2025-11936 is a medium-severity vulnerability in Wolfssl, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2025-11-21.

How severe is CVE-2025-11936?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Wolfssl

CVE-2025-11936

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (35.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Wolfssl — versions 3.12.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

facts@wolfssl.com (Product)
facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2025-11936?: CVE-2025-11936 is a medium-severity vulnerability in Wolfssl, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2025-11-21.
How severe is CVE-2025-11936?: Medium severity. CVSS v3 base score is 5.3 out of 10.