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.

Published: 2021-05-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-26558 is rated Low Risk (36.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.87%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-26558

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.87% +0.85%
2 2025-11-21 0.29% 0.02% -0.27%
3 2025-11-18 — 0.29% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-26558

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.2 3.1 MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.6 2.5 [email protected]
4.3 2.0 MEDIUM
AV:A/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 5.5 4.9 [email protected]

Weakness enumeration for CVE-2020-26558

OS Trackers for CVE-2020-26558

vendor priority summary link
debian not yet assigned CVE-2020-26558 not yet assigned priority: Debian including 2 source packages (bluez, linux), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2020-26558
gentoo high CVE-2020-26558: 1 GLSA(s) (202209-16), 1 atom(s) (net-wireless/bluez); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-26558
redhat medium — https://access.redhat.com/security/cve/CVE-2020-26558
suse medium — https://www.suse.com/security/cve/CVE-2020-26558/
ubuntu medium CVE-2020-26558 medium priority: Ubuntu including 169 source packages (bluez, linux, …), 2181 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1682, released 224, not-affected 220, ignored 53, needed 1, needs-triage 1. https://ubuntu.com/security/CVE-2020-26558

Affected software / configurations for CVE-2020-26558

Vendor Product Version Raw CPE
bluetooth bluetooth_core_specification >= 2.1, <= 5.2 cpe:2.3:a:bluetooth:bluetooth_core_specification:*:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
linux linux_kernel < 5.13 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
intel ax210_firmware — cpe:2.3:o:intel:ax210_firmware:-:*:*:*:*:*:*:*
intel ax201_firmware — cpe:2.3:o:intel:ax201_firmware:-:*:*:*:*:*:*:*
intel ax200_firmware — cpe:2.3:o:intel:ax200_firmware:-:*:*:*:*:*:*:*
intel ac_9560_firmware — cpe:2.3:o:intel:ac_9560_firmware:-:*:*:*:*:*:*:*
intel ac_9462_firmware — cpe:2.3:o:intel:ac_9462_firmware:-:*:*:*:*:*:*:*
intel ac_9461_firmware — cpe:2.3:o:intel:ac_9461_firmware:-:*:*:*:*:*:*:*
intel ac_9260_firmware — cpe:2.3:o:intel:ac_9260_firmware:-:*:*:*:*:*:*:*
intel ac_8265_firmware — cpe:2.3:o:intel:ac_8265_firmware:-:*:*:*:*:*:*:*
intel ac_8260_firmware — cpe:2.3:o:intel:ac_8260_firmware:-:*:*:*:*:*:*:*
intel ac_3168_firmware — cpe:2.3:o:intel:ac_3168_firmware:-:*:*:*:*:*:*:*
intel ac_7265_firmware — cpe:2.3:o:intel:ac_7265_firmware:-:*:*:*:*:*:*:*
intel ac_3165_firmware — cpe:2.3:o:intel:ac_3165_firmware:-:*:*:*:*:*:*:*
intel ax1675_firmware — cpe:2.3:o:intel:ax1675_firmware:-:*:*:*:*:*:*:*
intel ax1650_firmware — cpe:2.3:o:intel:ax1650_firmware:-:*:*:*:*:*:*:*
intel ac_1550_firmware — cpe:2.3:o:intel:ac_1550_firmware:-:*:*:*:*:*:*:*

References for CVE-2020-26558

URL Tags
https://kb.cert.org/vuls/id/799380 Third Party Advisory US Government Resource
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00022.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NSS6CTGE4UGTJLCOZOASDR3T3SLL6QJZ/
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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