What’s Vulnerable › Vulnerabilities

CVE-2021-28139

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% 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 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.

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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