CVE-2025-12888
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductWolfssl
PublishedNov 21, 2025
First seenNov 21, 2025
Weakness typeCWE-203CWE-203
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | 5.8.2 | — |
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