What is CVE-2023-21401?

CVE-2023-21401 is a critical-severity vulnerability in Google Android. CVSS score: 9.8/10. Published 2023-12-04.

How severe is CVE-2023-21401?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Google Android

CVE-2023-21401

In DevmemIntChangeSparse of devicemem_server.c, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.

Published 2023-12-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.4th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Google Android — versions Android SoC

References

source.android.com/security/bulletin/2023-12-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-21401?: CVE-2023-21401 is a critical-severity vulnerability in Google Android. CVSS score: 9.8/10. Published 2023-12-04.
How severe is CVE-2023-21401?: Critical severity. CVSS v3 base score is 9.8 out of 10.