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CVE-2025-12888

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Date: November 21, 2025

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.

Severity Score

Related Resources (4)

https://https://github.com/wolfSSL/wolfssl/pull/9275
https://github.com/wolfSSL/wolfssl/pull/9275
https://nvd.nist.gov/vuln/detail/CVE-2025-12888
https://www.mend.io/vulnerability-database/CVE-2025-12888

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Top Fix

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Upgrade to version https://github.com/wolfSSL/wolfssl.git - v5.8.4-stable

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CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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