What is CVE-2021-25355?

CVE-2021-25355 is a medium-severity vulnerability in Samsung Notes, classified under Improper Authorization. CVSS score: 5.5/10. Published 2021-03-25.

How severe is CVE-2021-25355?

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

Auth bypass in Samsung Notes

CVE-2021-25355

Using unsafe PendingIntent in Samsung Notes prior to version 4.2.00.22 allows local attackers unauthorized action without permission via hijacking the PendingIntent.

Published 2021-03-25 · 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 (10.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.4% 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)

References

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

Frequently asked questions

What is CVE-2021-25355?: CVE-2021-25355 is a medium-severity vulnerability in Samsung Notes, classified under Improper Authorization. CVSS score: 5.5/10. Published 2021-03-25.
How severe is CVE-2021-25355?: Medium severity. CVSS v3 base score is 5.5 out of 10.