CVE-2025-12889— TLS 1.2 Client Can Downgrade Digest Used
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存在安全漏洞，该漏洞源于使用 TLS 1.2 连接时，客户端可以使用任何较弱的摘要算法。
Possible ATT&CK Techniques 1 AI
T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-12889
Vulnerability Information
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Vulnerability Title
TLS 1.2 Client Can Downgrade Digest Used
Source: CVE Program / CVE List V5
Vulnerability Description
With TLS 1.2 connections a client can use any digest, specifically a weaker digest that is supported, rather than those in the CertificateRequest.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
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存在安全漏洞，该漏洞源于使用 TLS 1.2 连接时，客户端可以使用任何较弱的摘要算法。
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-2025-12889
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2025-11936 | Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 Clie | |
| 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 |
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V. Comments for CVE-2025-12889
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