Is CVE-2023-21803 actively exploited?

No active exploitation of CVE-2023-21803 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21803 be exploited remotely?

Yes. CVE-2023-21803 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21803?

CVE-2023-21803 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-21803

CRITICAL

CVE-2023-21803

CWE-190Published: February 14, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Windows iSCSI Discovery Service Remote Code Execution Vulnerability

NVD Source

Risk Analysis

This vulnerability affects the Windows iSCSI Discovery Service, potentially allowing remote code execution. Given the critical CVSS score, it poses a high risk to affected Windows 10 versions.

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

Recommended Action

Apply the latest security patches provided by Microsoft for the affected Windows 10 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-2023-21803 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.