What is CVE-2025-12888?

CVE-2025-12888 is a high-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2025-11-21.

How severe is CVE-2025-12888?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Wolfssl

CVE-2025-12888

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.

EPSS: 0.003 (21.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Wolfssl — versions 0, 5.8.2

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

facts@wolfssl.com (Broken Link)

Frequently asked questions

What is CVE-2025-12888?: CVE-2025-12888 is a high-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2025-11-21.
How severe is CVE-2025-12888?: High severity. CVSS v3 base score is 7.5 out of 10.