What’s Vulnerable › Vulnerabilities

CVE-2021-28135

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-07 · updated 2026-06-17

Description

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service (crash) in ESP32 by flooding the target device with LMP Feature Response data.

Affected products

• espressif esp-idf: through 4.4

References

• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://github.com/espressif/esp-idf
• https://github.com/espressif/esp32-bt-lib
• https://www.espressif.com/en/products/socs/esp32
• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://github.com/espressif/esp-idf
• https://github.com/espressif/esp32-bt-lib
• https://www.espressif.com/en/products/socs/esp32

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