Is CVE-2023-21503 actively exploited?

No active exploitation of CVE-2023-21503 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21503 be exploited remotely?

Yes. CVE-2023-21503 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21503?

CVE-2023-21503 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-21503

CRITICAL

CVE-2023-21503

CWE-20Published: May 4, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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.

NVD Source

Risk Analysis

The Shannon baseband in Samsung devices contains a buffer overflow vulnerability that allows remote attackers to trigger invalid memory access. The 9.8 CVSS score underscores the critical nature of this memory corruption issue.

There is no known public exploit, and it is not in the KEV catalog. It is remotely exploitable with low attack complexity.

Recommended Action

Update affected Samsung devices to the SMR May-2023 Release 1 or later to patch the baseband vulnerability.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-21503 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.