PT-2025-47821 · Espressif+2 · Esp32+2

Adrian Cinal · Published 2025-11-21 · Updated 2025-12-04 · CVE-2025-12888

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions X25519 (affected versions not specified)

Description A flaw exists in X25519 constant-time cryptographic implementations due to timing side channels. These side channels are introduced by compiler optimizations and CPU architecture limitations, particularly affecting Xtensa-based ESP32 chips. When targeting Xtensa, utilizing the low memory implementations of X25519 is recommended. The low memory implementations are now the default for Xtensa.

Recommendations For Xtensa-based ESP32 chips, use the low memory implementations of X25519.

Fix

Side Channel Attack

Weakness Enumeration

CWE-203

Related Identifiers

CVE-2025-12888

Affected Products

Debian

Esp32

X25519

References · 14

• https://cve.org/CVERecord?id=CVE-2025-12888 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-12888 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-12888 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-12888 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-12888 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-12888 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-12888 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl/pull/9275 · Note
• https://t.me/msrcreports/2309 · Telegram Post
• https://twitter.com/dailycve/status/1996657249776029802 · Twitter Post
• https://twitter.com/CVEnew/status/1992008937185419581 · Twitter Post
• https://https//github.com/wolfSSL/wolfssl/pull/9275 · Note
• https://t.me/CVEtracker/37993 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1992047045281005895 · Twitter Post