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Vulnerability record · CVE-2020-26558 · published 24 May 2021

CVE-2020-26558: Bluetooth core specification improper authentication vulnerability

Bluetooth · Bluetooth Core Specification

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.

4.2 CVSS 3.1 Medium EPSS 0.87% · top 42.7% CWE-287 · Improper authentication
4.2CVSS 3.1 base score, v2 4.3
0.87%EPSS exploitation probability, 30 days
NoNot in CISA KEV
19Affected product versions listed by NVD
21References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

19 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00022.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NSS6CTGE4UGTJLCOZOASDR3
https://security.gentoo.org/glsa/202209-16 Third Party Advisory
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ Vendor Advisory
https://www.debian.org/security/2021/dsa-4951 Third Party Advisory
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00517.html Third Party Advisory
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00520.html Third Party Advisory
https://kb.cert.org/vuls/id/799380 Third Party AdvisoryUS Government Resource
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00022.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NSS6CTGE4UGTJLCOZOASDR3
https://security.gentoo.org/glsa/202209-16 Third Party Advisory
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/ Vendor Advisory
https://www.debian.org/security/2021/dsa-4951 Third Party Advisory
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00517.html Third Party Advisory
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00520.html Third Party Advisory
https://www.kb.cert.org/vuls/id/799380

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Source: NIST National Vulnerability Database (record CVE-2020-26558), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.