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CVE-2025-11936— Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello

Quick assessment

Affected
wolfSSL wolfSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL（CyaSSL） v5.8.2版本存在安全漏洞，该漏洞源于TLS 1.3 KeyShareEntry解析输入验证不当，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.43% · P35
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I. Basic Information for CVE-2025-11936

Vulnerability Information
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Vulnerability Title
Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL（CyaSSL） v5.8.2版本存在安全漏洞，该漏洞源于TLS 1.3 KeyShareEntry解析输入验证不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 3.12.0 ~ 5.8.4 -

II. Public POCs for CVE-2025-11936

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III. Intelligence Information for CVE-2025-11936

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Vendor Pages for CVE-2025-11936 (1)

Same Patch Batch · wolfSSL · 2025-11-21 · 7 CVEs total

CVE-2025-11934 Improper Validation of Signature Algorithm Used in TLS 1.3 CertificateVerify
CVE-2025-11935 Forward Secrecy Violation in WolfSSL TLS 1.3
CVE-2025-12888 Constant Time Issue with Xtensa-based ESP32 and X22519
CVE-2025-11931 Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt
CVE-2025-11932 Timing Side-Channel in PSK Binder Verification
CVE-2025-12889 TLS 1.2 Client Can Downgrade Digest Used

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-20

V. Comments for CVE-2025-11936

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