Out-of-bounds Read in Espressif Esp-Idf

CVE-2025-66409

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.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-66409: held from 0.006 to 0.006.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

  • Espressif Esp-Idf — versions >= 5.5-beta1, <= 5.5.1, >= 5.4-beta1, <= 5.4.3, >= 5.3-beta1, <= 5.3.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-66409?
CVE-2025-66409 is a critical-severity vulnerability in Espressif Esp-Idf, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2025-12-02.
How severe is CVE-2025-66409?
Critical severity. CVSS v3 base score is 9.1 out of 10.