CVE-2023-21153

Local privilege escalation via unchecked call-waiting data

Published Jun 28, 2023 · Updated Dec 3, 2024

Out-of-bounds read in the Android kernel IMS service allows local users with System execution privileges to elevate privileges without interaction. The Do_AIMS_SET_CALL_WAITING function in imsservice.cpp reads beyond an input buffer because it does not validate bounds. Exploitation requires existing System execution privileges and no user interaction, and successful abuse grants higher local privileges.

CVSS severity6.7
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Android kernel IMS service allows local users with System execution privileges to elevate privileges without interaction. The Do_AIMS_SET_CALL_WAITING function in imsservice.cpp reads beyond an input buffer because it does not validate bounds. Exploitation requires existing System execution privileges and no user interaction, and successful abuse grants higher local privileges.

The record

CVE
CVE-2023-21153
Published
Jun 28, 2023
Updated
Dec 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-125, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 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=Android kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android kernel

Published CVSS scores

6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1404Exploitation 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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