Auth bypass in Bluetooth Mesh Profile
CVE-2020-26557
Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device (without possession of the AuthValue used in the provisioning protocol) to determine the AuthValue via a brute-force attack (unless the AuthValue is sufficiently random and changed each time).
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Bluetooth Mesh Profile — versions 1.0.0, 1.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/repor… (Vendor Advisory)
- kb.cert.org/vuls/id/799380 (US Government Resource, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2020-26557?
- CVE-2020-26557 is a high-severity vulnerability in Bluetooth Mesh Profile, classified under Improper Authentication. CVSS score: 7.5/10. Published 2021-05-24.
- How severe is CVE-2020-26557?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-26557 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.