CVE-2021-28139

moderate-risk
Published 2021-09-07

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.

Do I need to act?

~
1.6% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
ADJACENT_NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Espressif

References (8)

Technical Description https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
Product https://github.com/espressif/esp-idf
Product https://github.com/espressif/esp32-bt-lib
Product https://www.espressif.com/en/products/socs/esp32
Technical Description https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
Product https://github.com/espressif/esp-idf
Product https://github.com/espressif/esp32-bt-lib
Product https://www.espressif.com/en/products/socs/esp32
36
/ 100
moderate-risk
Severity 27/34 · High
Exploitability 4/34 · Minimal
Exposure 5/34 · Minimal