CVE-2025-11933
DoS Vulnerability in wolfSSL TLS 1.3 CKS Extension
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.
INFO
Published Date :
Nov. 21, 2025, 10:19 p.m.
Last Modified :
Nov. 21, 2025, 10:19 p.m.
Remotely Exploit :
Yes !
Source :
wolfSSL
Affected Products
The following products are affected by CVE-2025-11933
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | LOW | 50d2cd11-d01a-48ed-9441-5bfce9d63b27 |
Solution
- Update wolfSSL to a fixed version.
- Ensure TLS 1.3 CKS extension parsing is validated.
- Block crafted ClientHello messages.
- Monitor network traffic for suspicious messages.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-11933 vulnerability anywhere in the article.