CVE-2023-21253

Local service crashes via excessive APK signers

Published Oct 6, 2023 · Updated Sep 19, 2024

Resource exhaustion in Google Android 11, 12, 12L, and 13 allows local users to crash multiple system services using a crafted APK. The v1 and v2 APK signature verifiers accepted an unbounded number of signers, consuming excessive resources while parsing signer data. A local user can supply the APK without additional execution privileges or user interaction, causing availability-only service interruption.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Google Android 11, 12, 12L, and 13 allows local users to crash multiple system services using a crafted APK. The v1 and v2 APK signature verifiers accepted an unbounded number of signers, consuming excessive resources while parsing signer data. A local user can supply the APK without additional execution privileges or user interaction, causing availability-only service interruption.

The record

CVE
CVE-2023-21253
Published
Oct 6, 2023
Updated
Sep 19, 2024
Vendor
Google
Product
Android
Classifications
CWE-400, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=11
  2. Affected versionversion=12
  3. Affected versionversion=12L
  4. Affected versionversion=13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · Androidversion=11; version=12; version=12L; version=13

Published CVSS scores

5.5NIST NVDCVSS: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

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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-400Uncontrolled Resource Consumption
T1499Endpoint 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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