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Vulnerability record · CVE-2021-28139 · published 7 September 2021

CVE-2021-28139: Espressif esp-idf vulnerability

EEspressif · Esp Idf

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly restrict the Feature Page upon reception of an LMP Feature Response Extended packet, allowing attackers in radio range to trigger arbitrary code execution in ESP32 via a crafted Extended Features bitfield payload.

8.8 CVSS 3.1 High EPSS 1.4% · top 28.8%
8.8CVSS 3.1 base score, v2 8.3
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly restrict the Feature Page upon reception of an LMP Feature Response Extended packet, allowing attackers in radio range to trigger arbitrary code execution in ESP32 via a crafted Extended Features bitfield payload.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical DescriptionThird Party Advisory
https://github.com/espressif/esp-idf ProductThird Party Advisory
https://github.com/espressif/esp32-bt-lib ProductThird Party Advisory
https://www.espressif.com/en/products/socs/esp32 ProductVendor Advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf Technical DescriptionThird Party Advisory
https://github.com/espressif/esp-idf ProductThird Party Advisory
https://github.com/espressif/esp32-bt-lib ProductThird Party Advisory
https://www.espressif.com/en/products/socs/esp32 ProductVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-28139), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.