CVE-2023-21803

Name: CVE-2023-21803
Creator: NVD / NIST
Published: 2023-02-14T20:15:15.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.76%

Last modified Jun 17, 2026

CVE-2023-21803 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Windows iSCSI Discovery Service Remote Code Execution Vulnerability. EPSS estimates a 1.76% chance of exploitation in the next 30 days.

Description

Windows iSCSI Discovery Service Remote Code Execution Vulnerability

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.76%

75.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10	< 10.0.10240.19747	—
Microsoft	Windows 10 1607	< 10.0.14393.5717	—
Microsoft	Windows 10 1809	< 10.0.17763.4010	—
Microsoft	Windows 10 20h2	< 10.0.19042.2604	—
Microsoft	Windows 10 21h2	< 10.0.19044.2604	—
Microsoft	Windows 10 22h2	< 10.0.19045.2604	—
Microsoft	Windows Server 2008	All versions	Sp2

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21803Patch, Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21803Patch, Vendor Advisory

Timeline

Published: Feb 14, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-21803?

Windows iSCSI Discovery Service Remote Code Execution Vulnerability

How severe is CVE-2023-21803?

CVE-2023-21803 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.76% probability of exploitation in the next 30 days.

How do I fix CVE-2023-21803?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-21803?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST