Vulnerability in Zh-Jieli Ac6901
CVE-2021-31611
The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.zh-jieli.com/product/68-cn.html (Vendor Advisory)
- launchstudio.bluetooth.com/ListingDetails/58628 (Third Party Advisory)
- launchstudio.bluetooth.com/ListingDetails/19746 (Third Party Advisory)
- dl.packetstormsecurity.net/papers/general/braktooth.pdf (Broken Link)
Frequently asked questions
- What is CVE-2021-31611?
- CVE-2021-31611 is a medium-severity vulnerability in Zh-Jieli Ac6901, classified under Improper Locking. CVSS score: 5.7/10. Published 2021-09-07.
- How severe is CVE-2021-31611?
- Medium severity. CVSS v3 base score is 5.7 out of 10.
- Is CVE-2021-31611 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.