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CVE-2021-37577

Bluetooth LE and BR/EDR Secure Connections pairing and Secure Simple Pairing using the Passkey entry protocol in Bluetooth Core…

Medium6.8EPSS 0.24%
Published
Updated
Reserved
Assigned by
mitre

Description

Bluetooth LE and BR/EDR Secure Connections pairing and Secure Simple Pairing using the Passkey entry protocol in Bluetooth Core Specifications 2.1 through 5.3 may permit an unauthenticated man-in-the-middle attacker to identify the Passkey used during pairing by reflection of a crafted public key with the same X coordinate as the offered public key and by reflection of 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. This is a related issue to CVE-2020-26558.

Timeline

  1. ID reserved

    By mitre

  2. · 3 years later

    Published

  3. · 45 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-37577, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium6.8CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
NVDNVD · Deferred3.1Medium6.8CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
EPSS (exploitation in 30 days)
0.24% · top 85% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.

Weakness

Affected products

  • n/a

    • affected n/a

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .