CVE-2021-0550

Local privilege escalation via confused-deputy permission grant

Published Jun 22, 2021 · Updated Aug 3, 2024

Confused-deputy privilege escalation in Android 11 Framework allows local users to gain WRITE_EXTERNAL_STORAGE without user interaction. AnnotateActivity.onLoadFailed mishandles a failed annotation load and delegates storage-permission acquisition without obtaining user consent. A local low-privileged application gains write access to external storage without additional execution privileges or user action.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Confused-deputy privilege escalation in Android 11 Framework allows local users to gain WRITE_EXTERNAL_STORAGE without user interaction. AnnotateActivity.onLoadFailed mishandles a failed annotation load and delegates storage-permission acquisition without obtaining user consent. A local low-privileged application gains write access to external storage without additional execution privileges or user action.

The record

CVE
CVE-2021-0550
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-610, T1626
Attack vector
local
Privileges
Unavailable

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?

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

  1. Affected versionversion=Android-11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-11

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-610Externally Controlled Reference to a Resource in Another Sphere
T1626Exploitation for Privilege Escalation

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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