CVE-2021-28136

low-risk
Published 2021-09-07

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of multiple LMP IO Capability Request packets during the pairing process, allowing attackers in radio range to trigger memory corruption (and consequently a crash) in ESP32 via a replayed (duplicated) LMP packet.

Do I need to act?

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0.26% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
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
27
/ 100
low-risk
Severity 21/34 · High
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal