CVE-2025-11936— Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2025-11936
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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
- CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5188
Integer underflow in X.509 SAN parsing in wolfSSL - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V - CVE-2026-5466
wc_VerifyEccsiHash missing sanity check
Same vendor: wolfSSL
- CVE-2026-0930
Potential wolfSSHd Buffer out-of-bounds Read on Windows Hand - CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5188
Integer underflow in X.509 SAN parsing in wolfSSL - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V
Same weakness: CWE-20
V. Comments for CVE-2025-11936
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