CVE-2023-21538

Name: CVE-2023-21538
Creator: NVD / NIST
Published: 2023-01-10T22:15:14.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.74%

Last modified Jun 17, 2026

CVE-2023-21538 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. .NET Denial of Service Vulnerability. EPSS estimates a 2.74% chance of exploitation in the next 30 days.

Description

.NET Denial of Service Vulnerability

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.74%

84.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Microsoft	.Net	6.0.0
Microsoft	Powershell	7.2
Fedoraproject	Fedora	36
Fedoraproject	Fedora	37

References

Timeline

Published: Jan 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-21538?

.NET Denial of Service Vulnerability

How severe is CVE-2023-21538?

CVE-2023-21538 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.74% probability of exploitation in the next 30 days.

How do I fix CVE-2023-21538?

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-2023-21538?

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

Scan your code now

Source: NVD / NIST