CVE-2021-0383

Local privilege escalation via unprotected exported activity

Published Mar 10, 2021 · Updated Aug 3, 2024

Privilege escalation in Android 11 allows local users to reset carrier actions by launching an unprotected captive-portal activity. The CarrierDefaultApp manifest exports CaptivePortalLoginActivity without a permission check, and done() can invoke resetAllCarrierActions. A local app needs no user interaction or added execution privilege to alter carrier settings through the activity.

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

Privilege escalation in Android 11 allows local users to reset carrier actions by launching an unprotected captive-portal activity. The CarrierDefaultApp manifest exports CaptivePortalLoginActivity without a permission check, and done() can invoke resetAllCarrierActions. A local app needs no user interaction or added execution privilege to alter carrier settings through the activity.

The record

CVE
CVE-2021-0383
Published
Mar 10, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
T1626
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 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?

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  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

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

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

T1626Abuse Elevation Control Mechanism

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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