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)
Core 1
Core References
Scores
CVSS v3
7.5
EPSS
0.0026
EPSS Percentile
16.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-203
Status
published
Products (1)
wolfssl/wolfssl
5.8.2
Published
Nov 21, 2025
Tracked Since
Feb 18, 2026