CVE-2021-0644

Trackable identifier disclosure via missing permission check

Published Oct 6, 2021 · Updated Aug 3, 2024

Information disclosure in Android 10 and Android 11 allows local users to retrieve a trackable subscription-group identifier without interaction. SubscriptionController.conditionallyRemoveIdentifiers leaves SubscriptionInfo.mGroupUUID intact when callers hold READ_PHONE_STATE but lack READ_DEVICE_IDENTIFIERS. Code execution with ordinary user privileges is required, and exposure is limited to the persistent subscription-group identifier.

CVSS severityUnavailable
Unscored
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 10 and Android 11 allows local users to retrieve a trackable subscription-group identifier without interaction. SubscriptionController.conditionallyRemoveIdentifiers leaves SubscriptionInfo.mGroupUUID intact when callers hold READ_PHONE_STATE but lack READ_DEVICE_IDENTIFIERS. Code execution with ordinary user privileges is required, and exposure is limited to the persistent subscription-group identifier.

The record

CVE
CVE-2021-0644
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
T1533
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 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 Android-10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-11 Android-10

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1533Data from Local System

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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