CVE-2025-11933 - CVE House
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Status published Low CVE-2025-11933

DoS Vulnerability in wolfSSL TLS 1.3 CKS Extension

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Jaehun Lee, Pohang University of Science and Technology (POSTECH)
  • Kyungmin Bae, Pohang University of Science and Technology (POSTECH)

References

Affected Vendor

Affected Software

wolfSSL
Vulnerable Versions:
3.12.0

Timeline

Official Publish: November 21st, 2025
Last Modified: December 8th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-20

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1213 Data from Information Repositories
Collection
T1565.002 Stored Data Manipulation
Impact