CVE-2025-12888— Constant Time Issue with Xtensa-based ESP32 and X22519
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过差异性导致的信息暴露
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
II. Public POCs for CVE-2025-12888
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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-2025-11931 | 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-203
- CVE-2026-44263
Weblate: Private Translation Enumeration via Screenshot API - CVE-2023-5872
Wago: Vulnerability in Smart Designer Web-Application - CVE-2026-33429
Parse Server: Protected field change detection oracle via Li - CVE-2026-33425
Discourse has inferable private group membership or existenc - CVE-2026-3580
Compiler-induced timing leak in sp_256_get_entry_256_9 on RI
V. Comments for CVE-2025-12888
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