CVE-2023-21016

Local service interruption via multiline account names

Published Mar 24, 2023 · Updated Mar 17, 2025

Improper input validation in Android 13 AccountTypePreference allows local users to interrupt service through a crafted account name. The Settings component renders an account-controlled name without a single-line restriction, allowing embedded line breaks to misrepresent installed accounts. Exploitation needs no additional execution privileges or user interaction, and the reported consequence is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Android 13 AccountTypePreference allows local users to interrupt service through a crafted account name. The Settings component renders an account-controlled name without a single-line restriction, allowing embedded line breaks to misrepresent installed accounts. Exploitation needs no additional execution privileges or user interaction, and the reported consequence is limited to availability.

The record

CVE
CVE-2023-21016
Published
Mar 24, 2023
Updated
Mar 17, 2025
Vendor
Google Cloud
Product
Android
Classifications
T1642
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2025Record 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-13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-13

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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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

T1642Endpoint Denial of Service

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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