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CVE-2025-12888— Constant Time Issue with Xtensa-based ESP32 and X22519

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，该漏洞源于编译器优化和CPU架构限制引入的时间侧信道，可能导致加密实现被攻击。

AI Predicted 5.3 Difficulty: Hard EPSS 0.29% · P19
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I. Basic Information for CVE-2025-12888

Vulnerability Information
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Vulnerability Title
Constant Time Issue with Xtensa-based ESP32 and X22519
Source: CVE Program / CVE List V5
Vulnerability Description
Vulnerability in X25519 constant-time cryptographic implementations due to timing side channels introduced by compiler optimizations and CPU architecture limitations, specifically with the Xtensa-based ESP32 chips. If targeting Xtensa it is recommended to use the low memory implementations of X25519, which is now turned on as the default for Xtensa.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:P/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
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，该漏洞源于编译器优化和CPU架构限制引入的时间侧信道，可能导致加密实现被攻击。
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 0 ~ 5.8.4 -

II. Public POCs for CVE-2025-12888

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III. Intelligence Information for CVE-2025-12888

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Other References for CVE-2025-12888 (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-2025-11936 Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 Clie
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-203

V. Comments for CVE-2025-12888

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