Vulnerability in Espressif Esp-Idf
CVE-2021-28135
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.
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: 0.008 (55.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% 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: 0.008 · change: -0.000
Affected products
Public proof-of-concept exploits
References
- github.com/espressif/esp-idf (Third Party Advisory)
- github.com/espressif/esp32-bt-lib (Third Party Advisory)
- www.espressif.com/en/products/socs/esp32 (Product)
- dl.packetstormsecurity.net/papers/general/braktooth.pdf (Broken Link)
Frequently asked questions
- What is CVE-2021-28135?
- CVE-2021-28135 is a medium-severity vulnerability in Espressif Esp-Idf. CVSS score: 6.5/10. Published 2021-09-07.
- How severe is CVE-2021-28135?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-28135 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.