CVE-2021-0979

Cross-user package disclosure via unchecked user ID

Published Dec 15, 2021 · Updated Aug 3, 2024

Information disclosure in ShortcutService in Google Cloud Android 12 allows local users to identify packages supported by another user's launcher. The isRequestPinItemSupported method accepts a caller-supplied user ID without verifying that it matches the caller's user, then queries that user's default launcher support. A low-privileged local app needs no user interaction and can infer cross-user package availability without modifying data or interrupting the device.

CVSS severity5.5
Medium
EPSS probability0.10%
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 ShortcutService in Google Cloud Android 12 allows local users to identify packages supported by another user's launcher. The isRequestPinItemSupported method accepts a caller-supplied user ID without verifying that it matches the caller's user, then queries that user's default launcher support. A low-privileged local app needs no user interaction and can infer cross-user package availability without modifying data or interrupting the device.

The record

CVE
CVE-2021-0979
Published
Dec 15, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-276, T1518
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 15, 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-12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-12

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1518Software 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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