CVE-2025-12888 - CVE House
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Status published Low CVE-2025-12888

Constant Time Issue with Xtensa-based ESP32 and X22519

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Adrian Cinal

References

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Affected Vendor

Affected Software

wolfSSL
Vulnerable Versions:
0

Timeline

Official Publish: November 21st, 2025
Last Modified: December 8th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-203

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1213 Data from Information Repositories
Collection
T1046 Network Service Discovery
Discovery