What is CVE-2023-21243?

CVE-2023-21243 is a medium-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2023-07-13.

How severe is CVE-2023-21243?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Google Android

CVE-2023-21243

In validateForCommonR1andR2 of PasspointConfiguration.java, there is a possible way to inflate the size of a config file with no limits due to a buffer overflow. This could lead to local denial of service with no additional execution privileges needed. User interaction is needed for exploitation.

Vulnerability class: Buffer Overflow

Published 2023-07-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.1% 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 — versions 12, 11.0, 11

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

android.googlesource.com/platform/packages/modules/Wifi/+/5b49b8711efaadadf5052… (Patch)
source.android.com/security/bulletin/2023-07-01 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-21243?: CVE-2023-21243 is a medium-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2023-07-13.
How severe is CVE-2023-21243?: Medium severity. CVSS v3 base score is 5.5 out of 10.