CVE-2025-12888
Constant Time Issue with Xtensa-based ESP32 and X22519
- State
- Published
- Severity
- 1.0 Low
- Published
- Nov 21, 2025
- Updated
- Dec 8, 2025
- Reserved
- Nov 7, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 1.0 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 | wolfSSL |
Weaknesses
- CWE-203 Observable Discrepancy
Affected Products
| Product | Versions |
|---|---|
wolfSSLwolfSSL |
|
References
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