Is CVE-2023-21504 actively exploited?

No active exploitation of CVE-2023-21504 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21504 be exploited remotely?

Yes. CVE-2023-21504 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21504?

CVE-2023-21504 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-21504

CRITICAL

CVE-2023-21504

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

9.8

CVSS v3.1

Official Description

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

NVD Source

Risk Analysis

A buffer overflow vulnerability in the Shannon baseband of certain Samsung Android devices could allow remote attackers to cause invalid memory access. This critical flaw is rated 9.8, posing a significant risk to device stability and security.

No public exploit is known, and it is not in the KEV catalog. The vulnerability is remotely exploitable with low attack complexity.

Recommended Action

Apply the SMR May-2023 Release 1 or later security updates provided by Samsung for the affected Android versions.

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-2023-21504 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.