CVE-2022-20494Public exploit

Persistent device denial via unbounded zen rules

Published Jan 24, 2023 · Updated Apr 3, 2025

Resource exhaustion in Android 10, 11, 12, 12L, and 13 allows local users to cause a persistent denial of service through malicious zen rules. AutomaticZenRule constructors accept oversized name and condition URI strings, letting addAutomaticZenRule persist enough rule data to exhaust NotificationManagerService memory. A malicious app must obtain ACCESS_NOTIFICATION_POLICY; successful exploitation can leave the screen black or repeatedly crash and reboot the device.

CVSS severity5.5
Medium
EPSS probability0.43%
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 Android 10, 11, 12, 12L, and 13 allows local users to cause a persistent denial of service through malicious zen rules. AutomaticZenRule constructors accept oversized name and condition URI strings, letting addAutomaticZenRule persist enough rule data to exhaust NotificationManagerService memory. A malicious app must obtain ACCESS_NOTIFICATION_POLICY; successful exploitation can leave the screen black or repeatedly crash and reboot the device.

The record

CVE
CVE-2022-20494
Published
Jan 24, 2023
Updated
Apr 3, 2025
Vendor
Google Cloud
Product
Android
Classifications
CWE-770, T1642
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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?

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  1. Affected versionversion=Android-10 Android-11 Android-12 Android-12L Android-13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-10 Android-11 Android-12 Android-12L 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

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1642Endpoint Denial of Service

Public exploit references

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Technologies

Your stack

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Your stack

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