What is CVE-2023-21477?

CVE-2023-21477 is a high-severity vulnerability in Samsung Android, classified under Out-of-bounds Read. CVSS score: 7.9/10. Published 2025-09-03.

How severe is CVE-2023-21477?

High severity. CVSS v3 base score is 7.9 out of 10.

Out-of-bounds Read in Samsung Android

CVE-2023-21477

Access of Memory Location After End of Buffer vulnerability in TIGERF trustlet prior to SMR Apr-2023 Release 1 allows local attackers to access protected data.

Vulnerability class: Buffer Overflow

Published 2025-09-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.9 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.0% 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

Samsung Android — versions 11.0, 12.0, 13.0
Samsung Mobile Devices — versions SMR Apr-2023 Release in Android 11, 12, 13

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2023-21477?: CVE-2023-21477 is a high-severity vulnerability in Samsung Android, classified under Out-of-bounds Read. CVSS score: 7.9/10. Published 2025-09-03.
How severe is CVE-2023-21477?: High severity. CVSS v3 base score is 7.9 out of 10.