What is CVE-2021-25339?

CVE-2021-25339 is a medium-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 4.4/10. Published 2021-03-04.

How severe is CVE-2021-25339?

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

Improper input validation in Google Android

CVE-2021-25339

Improper address validation in HArx in Samsung mobile devices prior to SMR Mar-2021 Release 1 allows an attacker, given a compromised kernel, to corrupt EL2 memory.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-03-04 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.001 (1.6th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.6% 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 — versions 10.0, 11.0
Samsung Exynos 9830
Samsung Mobile Devices — versions Selected Q(10.0), R(11.0)

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2021-25339?: CVE-2021-25339 is a medium-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 4.4/10. Published 2021-03-04.
How severe is CVE-2021-25339?: Medium severity. CVSS v3 base score is 4.4 out of 10.