CVE-2023-21156

Modem information disclosure via unchecked radio-node parsing

Published Jun 28, 2023 · Updated Dec 3, 2024

Out-of-bounds read in Google Android's rild_exynos component allows local users with System privileges to disclose modem data. BuildGetRadioNode in protocolmiscbulider.cpp reads beyond an intended buffer because radio-node input is not validated correctly. Exploitation requires System execution privileges and no user interaction; the documented consequence is limited to local modem-data disclosure.

CVSS severity4.4
Medium
EPSS probability0.09%
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 Google Android's rild_exynos component allows local users with System privileges to disclose modem data. BuildGetRadioNode in protocolmiscbulider.cpp reads beyond an intended buffer because radio-node input is not validated correctly. Exploitation requires System execution privileges and no user interaction; the documented consequence is limited to local modem-data disclosure.

The record

CVE
CVE-2023-21156
Published
Jun 28, 2023
Updated
Dec 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-125
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

4.4NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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.

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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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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