Constant Time Issue with Xtensa-based ESP32 and X22519_CVE-2025-12888

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LOW

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

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.

Basic Information

ID CVE-2025-12888

Source wolfSSL

Published Nov 21, 2025 at 22:50

Affected Product

Vendor wolfSSL

Product wolfSSL

Version 5.8.2

Affected Versions wolfSSL wolfSSL 5.8.2

CWE Classification

CWE-203

References

https //github.com/wolfSSL/wolfssl/pull/9275

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    "published": "2025-11-21T22:50:30.510Z",
    "modified": "2025-11-21T22:50:30.510Z",
    "type": "cve",
    "title": "Constant Time Issue with Xtensa-based ESP32 and X22519",
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