What is CVE-2021-25405?

CVE-2021-25405 is a medium-severity vulnerability in Samsung Notes, classified under Improper Access Control. CVSS score: 5.5/10. Published 2021-06-11.

How severe is CVE-2021-25405?

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

Vulnerability in Samsung Notes

CVE-2021-25405

An improper access control vulnerability in ScreenOffActivity in Samsung Notes prior to version 4.2.04.27 allows untrusted applications to access local files.

Published 2021-06-11 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.002 (12.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.3% 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

Samsung Notes
Samsung Mobile Notes — versions unspecified

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

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

Frequently asked questions

What is CVE-2021-25405?: CVE-2021-25405 is a medium-severity vulnerability in Samsung Notes, classified under Improper Access Control. CVSS score: 5.5/10. Published 2021-06-11.
How severe is CVE-2021-25405?: Medium severity. CVSS v3 base score is 5.5 out of 10.