What is CVE-2023-21156?

CVE-2023-21156 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Read. CVSS score: 4.4/10. Published 2023-06-28.

How severe is CVE-2023-21156?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Out-of-bounds Read in Google Android

CVE-2023-21156

In BuildGetRadioNode of protocolmiscbulider.cpp, there is a possible out of bounds read due to improper input validation. This could lead to local information disclosure from the modem with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-264540759References: N/A

Vulnerability class: Buffer Overflow

Published 2023-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.6th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Google Android
Android — versions Android kernel

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

source.android.com/security/bulletin/pixel/2023-06-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-21156?: CVE-2023-21156 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Read. CVSS score: 4.4/10. Published 2023-06-28.
How severe is CVE-2023-21156?: Medium severity. CVSS v3 base score is 4.4 out of 10.