Buffer overflow in Espressif Esp32
CVE-2021-28136
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/espressif/esp-idf (Product, Third Party Advisory)
- github.com/espressif/esp32-bt-lib (Product, Third Party Advisory)
- www.espressif.com/en/products/socs/esp32 (Product, Vendor Advisory)
- dl.packetstormsecurity.net/papers/general/braktooth.pdf (Technical Description, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28136?
- CVE-2021-28136 is a medium-severity vulnerability in Espressif Esp32, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2021-09-07.
- How severe is CVE-2021-28136?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-28136 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.