PT-2025-47818 · Wolfssl+1 · Wolfssl+1

Published 2025-11-21 · Updated 2025-12-03 · CVE-2025-11936

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Name of the Vulnerable Software and Affected Versions wolfSSL version 5.8.2

Description A flaw exists in the TLS 1.3 KeyShareEntry parsing within wolfSSL. This issue allows a remote, unauthenticated attacker to trigger a denial-of-service condition. The attack involves sending a specially crafted ClientHello message that includes duplicate KeyShareEntry values for the same supported group. This leads to excessive CPU and memory usage during the processing of the ClientHello message.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2025-11936

Affected Products

Debian

Wolfssl

References · 12

• 🔥 https://github.com/wolfSSL/wolfssl/pull/9117 · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-11936 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-11936 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-11936 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-11936 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-11936 · Security Note
• https://ubuntu.com/security/CVE-2025-11936 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-11936 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl · Note
• https://twitter.com/CVEnew/status/1992002730185924619 · Twitter Post
• https://t.me/CVEtracker/37991 · Telegram Post
• https://t.me/msrcreports/2304 · Telegram Post