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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/wolfSSL/wolfssl	Product
https://github.com/wolfSSL/wolfssl/pull/9117	Issue Tracking Patch
https://github.com/wolfSSL/wolfssl/pull/9117	Issue Tracking Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

History

03 Dec 2025, 18:47

Type	Values Removed	Values Added
References	~~() https://github.com/wolfSSL/wolfssl -~~	() https://github.com/wolfSSL/wolfssl - Product
References	~~() https://github.com/wolfSSL/wolfssl/pull/9117 -~~	() https://github.com/wolfSSL/wolfssl/pull/9117 - Issue Tracking, Patch
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.3
CPE		cpe:2.3:a:wolfssl:wolfssl::::::::
First Time		Wolfssl Wolfssl wolfssl

24 Nov 2025, 18:15

Type	Values Removed	Values Added
References	~~() https://github.com/wolfSSL/wolfssl/pull/9117 -~~	() https://github.com/wolfSSL/wolfssl/pull/9117 -

21 Nov 2025, 23:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-11-21 23:15

Updated : 2025-12-03 18:47

NVD link : CVE-2025-11936

Mitre link : CVE-2025-11936

CVE.ORG link : CVE-2025-11936

JSON object : View

Products Affected

wolfssl

wolfssl

CWE

CWE-20

Improper Input Validation

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