What is CVE-2021-25471?

CVE-2021-25471 is a low-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2021-10-06.

How severe is CVE-2021-25471?

Low severity. CVSS v3 base score is 3.7 out of 10.

Improper input validation in Google Android

CVE-2021-25471

A lack of replay attack protection in Security Mode Command process prior to SMR Oct-2021 Release 1 can lead to denial of service on mobile network connection and battery depletion.

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

Published 2021-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (31.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.4% 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 8.1, 9.0, 10.0
Samsung Exynos
Samsung Mobile Devices — versions O(8.1), P(9.0), Q(10.0) devices with Exynos CP chipsets

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2021-25471?: CVE-2021-25471 is a low-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2021-10-06.
How severe is CVE-2021-25471?: Low severity. CVSS v3 base score is 3.7 out of 10.