CVE-2021-0542

Paired Bluetooth address disclosure via unprotected broadcast

Published Jun 22, 2021 · Updated Aug 3, 2024

Information disclosure in Android 11 NFC allows local users to read paired Bluetooth addresses through a handover-cancel broadcast. BeamTransferManager.updateNotification sends ACTION_CANCEL_HANDOVER_TRANSFER as an unprotected broadcast, allowing any app to register a receiver and capture the peer address. Exploitation requires user interaction to reach the handover path, but the receiving app needs no permissions and gains only the paired device address.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Android 11 NFC allows local users to read paired Bluetooth addresses through a handover-cancel broadcast. BeamTransferManager.updateNotification sends ACTION_CANCEL_HANDOVER_TRANSFER as an unprotected broadcast, allowing any app to register a receiver and capture the peer address. Exploitation requires user interaction to reach the handover path, but the receiving app needs no permissions and gains only the paired device address.

The record

CVE
CVE-2021-0542
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-668, T1120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=Android-11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-11

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1120Peripheral Device Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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