What is CVE-2021-25461?

CVE-2021-25461 is a medium-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.0/10. Published 2021-09-09.

How severe is CVE-2021-25461?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2021-25461 known to be exploited?

14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Google Android

CVE-2021-25461

An improper length check in APAService prior to SMR Sep-2021 Release 1 results in stack based Buffer Overflow.

Vulnerability class: Buffer Overflow

Published 2021-09-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (5.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Android — versions 8.1
Samsung Mobile Devices — versions O(8.1)

Weakness classification (CWE)

Public proof-of-concept exploits

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25461?: CVE-2021-25461 is a medium-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.0/10. Published 2021-09-09.
How severe is CVE-2021-25461?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2021-25461 known to be exploited?: 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.