CVE-2025-11936
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-21

Last updated on: 2025-12-03

Assigner: wolfSSL Inc.

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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Meta Information
Published
2025-11-21
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-11-22
EPSS Evaluated
2026-06-14
NVD
CVE-2025-11936
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wolfssl wolfssl From 5.8.2 (inc) to 5.8.4 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
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Executive Summary

This vulnerability is caused by improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL version 5.8.2. A remote unauthenticated attacker can send a specially crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group. This causes excessive CPU and memory consumption during the processing of the ClientHello message, leading to a denial-of-service condition.

Impact Analysis

The vulnerability can lead to a denial-of-service (DoS) attack, where an attacker remotely causes the affected system to consume excessive CPU and memory resources. This can degrade system performance or cause the system to become unresponsive, potentially disrupting services relying on wolfSSL TLS 1.3 implementations.

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