CVE-2025-11933

Improper Input Validation in the TLS 1.3 CKS extension parsing in wolfSSL 5.8.2 and earlier on multiple platforms allows a remote unauthenticated attacker to potentially cause a denial-of-service via a crafted ClientHello message with duplicate CKS extensions.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/wolfSSL/wolfssl	Product
https://github.com/wolfSSL/wolfssl/pull/9132	Issue Tracking Patch

Configurations

Configuration 1 (hide)

AND

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

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*

History

08 Oct 2026, 10:10

Type	Values Removed	Values Added
Summary		(es) Validación de entrada incorrecta en el análisis de la extensión CKS de TLS 1.3 en wolfSSL 5.8.2 y versiones anteriores en múltiples plataformas permite a un atacante remoto no autenticado causar potencialmente una denegación de servicio mediante un mensaje ClientHello manipulado con extensiones CKS duplicadas.

Information

Published : 2025-11-21 23:15

Updated : 2026-10-08 10:10

NVD link : CVE-2025-11933

Mitre link : CVE-2025-11933

CVE.ORG link : CVE-2025-11933

JSON object : View

Products Affected

linux

linux_kernel

apple

macos

wolfssl

wolfssl

CWE

CWE-20

Improper Input Validation

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