What is CVE-2023-21503?

CVE-2023-21503 is a medium-severity vulnerability in Samsung Android, classified under Improper Input Validation. CVSS score: 5.6/10. Published 2023-05-04.

How severe is CVE-2023-21503?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Is CVE-2023-21503 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Samsung Android

CVE-2023-21503

Potential buffer overflow vulnerability in mm_LteInterRatManagement.c in Shannon baseband prior to SMR May-2023 Release 1 allows remote attackers to cause invalid memory access.

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

Published 2023-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (47.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Samsung Android — versions 13.0
Samsung Exynos
Samsung Mobile Devices — versions Select devices using Exynos CP chipsets

Weakness classification (CWE)

Public proof-of-concept exploits

N3vv/N3vv

References

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

Frequently asked questions

What is CVE-2023-21503?: CVE-2023-21503 is a medium-severity vulnerability in Samsung Android, classified under Improper Input Validation. CVSS score: 5.6/10. Published 2023-05-04.
How severe is CVE-2023-21503?: Medium severity. CVSS v3 base score is 5.6 out of 10.
Is CVE-2023-21503 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.