CVE-2023-21246

Notification access retention via oversized shortcut IDs

Published Jul 12, 2023 · Updated Nov 6, 2024

Privilege escalation in Google Android 11, 12, 12L, and 13 allows local users to retain notification listening access without interaction. ShortcutInfo permits a conversation shortcut ID longer than 65,535, causing FastDataOutput to throw before notification settings are saved. A local app needs no additional execution privileges, and the failed save leaves later notification restrictions ineffective.

CVSS severity3.3
Low
EPSS probability0.17%
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 Google Android 11, 12, 12L, and 13 allows local users to retain notification listening access without interaction. ShortcutInfo permits a conversation shortcut ID longer than 65,535, causing FastDataOutput to throw before notification settings are saved. A local app needs no additional execution privileges, and the failed save leaves later notification restrictions ineffective.

The record

CVE
CVE-2023-21246
Published
Jul 12, 2023
Updated
Nov 6, 2024
Vendor
Google
Product
Android
Classifications
CWE-754, CWE-273, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-273Improper Check for Dropped Privileges
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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