CVE-2023-21144Network attack vector

SystemUI hang via unbounded notification image loading

Published Jun 15, 2023 · Updated Dec 18, 2024

Denial of service in Android SystemUI 11, 12, 12L, and 13 allows remote attackers to hang SystemUI via a crafted notification image. NotificationInlineImageCache waits for oversized image data without a timeout, monopolizing the SystemUI background thread during notification inflation. A remote sender needs no execution privileges or user interaction, and the reported consequence is a temporary SystemUI hang rather than code execution or data access.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Android SystemUI 11, 12, 12L, and 13 allows remote attackers to hang SystemUI via a crafted notification image. NotificationInlineImageCache waits for oversized image data without a timeout, monopolizing the SystemUI background thread during notification inflation. A remote sender needs no execution privileges or user interaction, and the reported consequence is a temporary SystemUI hang rather than code execution or data access.

The record

CVE
CVE-2023-21144
Published
Jun 15, 2023
Updated
Dec 18, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 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 Android-12 Android-12L Android-13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-11 Android-12 Android-12L Android-13

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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