CVE-2021-31815

Sensitive contact-data disclosure via Android system logging

Published Apr 28, 2021 · Updated Aug 3, 2024

Information disclosure in GAEN through 2021-04-27 allows local users to read sensitive contact data via Android system logs. The Exposure Notification service writes Rolling Proximity Identifiers and associated Bluetooth MAC addresses to the shared logcat buffer instead of retaining them within the service. Exploitation requires a local preinstalled or system-level app with privileged log access, and the bounded consequence is disclosure of contact, social-graph, location-history, and sometimes infection-status data.

CVSS severity3.3
Low
EPSS probability0.13%
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 GAEN through 2021-04-27 allows local users to read sensitive contact data via Android system logs. The Exposure Notification service writes Rolling Proximity Identifiers and associated Bluetooth MAC addresses to the shared logcat buffer instead of retaining them within the service. Exploitation requires a local preinstalled or system-level app with privileged log access, and the bounded consequence is disclosure of contact, social-graph, location-history, and sometimes infection-status data.

The record

CVE
CVE-2021-31815
Published
Apr 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-319, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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-319Cleartext Transmission of Sensitive Information
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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