CVE-2025-12888

HIGH

Xtensa-based ESP32 - Timing Side Channel

Title source: llm

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.

References (1)

[Broken Link] https://https://github.com/wolfSSL/wolfssl/pull/9275

Scores

CVSS v3 7.5

EPSS 0.0001

EPSS Percentile 1.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-203

Status published

Products (1)

wolfssl/wolfssl 5.8.2

Published Nov 21, 2025

Tracked Since Feb 18, 2026