Is CVE-2023-21517 actively exploited?

No active exploitation of CVE-2023-21517 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21517 be exploited remotely?

Yes. CVE-2023-21517 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21517?

CVE-2023-21517 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-21517

CRITICAL

CVE-2023-21517

CWE-120Published: June 28, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Heap out-of-bound write vulnerability in Exynos baseband prior to SMR Jun-2023 Release 1 allows remote attacker to execute arbitrary code.

NVD Source

Risk Analysis

This vulnerability involves a heap out-of-bounds write in the Samsung Exynos baseband, which can lead to remote code execution. Given the critical 9.8 CVSS score, it poses a significant risk to affected devices.

There is no public exploit circulating for this issue, and it is not tracked in the KEV database.

Recommended Action

Ensure that all devices using affected Exynos basebands are updated to the security patch level released in June 2023 or later.

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-2023-21517 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.