CVE-2021-0337

Local privilege escalation via retained URI grants

Published Feb 10, 2021 · Updated Aug 3, 2024

File exposure flaw in Android 8.1 through 11 allows local users to escalate privileges through stale URI grants. FileSystemProvider fails to revoke persisted URI permissions when a document is deleted, renamed, or moved, leaving access grants attached to the old document identity. A malicious app with User execution privileges can reuse the stale grant without user interaction to access files associated with that identity.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

File exposure flaw in Android 8.1 through 11 allows local users to escalate privileges through stale URI grants. FileSystemProvider fails to revoke persisted URI permissions when a document is deleted, renamed, or moved, leaving access grants attached to the old document identity. A malicious app with User execution privileges can reuse the stale grant without user interaction to access files associated with that identity.

The record

CVE
CVE-2021-0337
Published
Feb 10, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-312, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Android-8.1 Android-9 Android-10 Android-11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-8.1 Android-9 Android-10 Android-11

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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-312Cleartext Storage of Sensitive Information
T1404Exploitation for Privilege Escalation

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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