CVE-2025-12888
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-21

Last updated on: 2025-12-04

Assigner: wolfSSL Inc.

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.
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Meta Information
Published
2025-11-21
Last Modified
2025-12-04
Generated
2026-06-16
AI Q&A
2025-11-22
EPSS Evaluated
2026-06-14
NVD
CVE-2025-12888
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wolfssl wolfssl 5.8.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-203 The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
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Executive Summary

This vulnerability is related to the X25519 cryptographic implementation on Xtensa-based ESP32 chips. It arises from timing side channels caused by compiler optimizations and CPU architecture limitations, which can potentially leak sensitive information during cryptographic operations. To mitigate this, it is recommended to use the low memory implementations of X25519, which are now the default for Xtensa.

Impact Analysis

The vulnerability could allow attackers to exploit timing side channels to gain information about cryptographic keys or operations on affected Xtensa-based ESP32 devices. This could weaken the security of cryptographic communications or data protected by X25519 on these devices.

Mitigation Strategies

If targeting Xtensa-based ESP32 chips, it is recommended to use the low memory implementations of X25519, which is now turned on as the default for Xtensa.

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