What’s Vulnerable › Vulnerabilities

CVE-2021-28136

• 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
• Weakness: CWE-787

Description

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.

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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