What is CVE-2026-21021?

CVE-2026-21021 is a medium-severity vulnerability in Samsung Android, classified under CWE-20: IMPROPER INPUT VALIDATION. CVSS score: 6.8/10. Published 2026-05-13.

How severe is CVE-2026-21021?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Samsung Android

CVE-2026-21021

Improper input validation in Routines prior to SMR May-2026 Release 1 allows physical attackers to launch privileged activity.

Published 2026-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.3% 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 Android — versions 16.0
Samsung Mobile Devices — versions SMR May-2026 Release in Android 16

References

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

Frequently asked questions

What is CVE-2026-21021?: CVE-2026-21021 is a medium-severity vulnerability in Samsung Android, classified under CWE-20: IMPROPER INPUT VALIDATION. CVSS score: 6.8/10. Published 2026-05-13.
How severe is CVE-2026-21021?: Medium severity. CVSS v3 base score is 6.8 out of 10.