CVE-2025-11933 Details
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.
A denial-of-service vulnerability has been identified in wolfSSL versions through 5.8.2. The issue arises from improper input validation in the parsing of the CKS extension within TLS 1.3. This vulnerability allows a remote, unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message that includes duplicate CKS extensions. The vulnerability is present on multiple platforms.
Users can upgrade to wolfSSL version 5.8.4 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Nov 24, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wolfSSL/wolfssl | [email protected] | Product |
| https://github.com/wolfSSL/wolfssl/pull/9132 | [email protected] | Issue TrackingPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wolfssl wolfssl | >= 5.8.2, < 5.8.4 |
CPE
Remediation
| |
| apple macos | All versions |
CPE
Remediation
| |
| linux linux kernel | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Dec 3, 2025 | Initial Analysis | [email protected] |
| Nov 21, 2025 | New CVE Received | [email protected] |