CVE-2025-66409: Espressif Esp-Idf

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In 5.5.1, 5.4.3, 5.3.4, 5.2.6, 5.1.6, and earlier, when AVRCP is enabled on ESP32, receiving a malformed VENDOR DEPENDENT command from a peer device can cause the Bluetooth stack to access memory before validating the command buffer length. This may lead to an out-of-bounds read, potentially exposing unintended memory content or causing unexpected behavior.

Affected products

• Espressif Esp-Idf: up to and including 5.1.6; from 5.2, up to and including 5.2.6; from 5.3, up to and including 5.3.4; from 5.4, up to and including 5.4.3; from 5.5, up to and including 5.5.1

Published 2025-12-02. Last modified 2026-06-17.