Auth bypass in Bluetooth Core Specification
CVE-2020-26558
Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication procedure) by reflection of the public key and the authentication evidence of the initiating device, potentially permitting this attacker to complete authenticated pairing with the responding device using the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit at a time.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% 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
- 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)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00520.html (Third Party Advisory)
- www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00517.html (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/06/msg00020.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/06/msg00019.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/06/msg00022.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2021/dsa-4951 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202209-16 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26558?
- CVE-2020-26558 is a medium-severity vulnerability in Bluetooth Core Specification, classified under Improper Authentication. CVSS score: 4.2/10. Published 2021-05-24.
- How severe is CVE-2020-26558?
- Medium severity. CVSS v3 base score is 4.2 out of 10.
- Is CVE-2020-26558 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.