CVE-2026-23666

Name: CVE-2026-23666
Creator: NVD / NIST
Published: 2026-04-14T18:16:44.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2026-23666 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.

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

1.03%

59.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-755

Affected Software

Vendor	Product	Versions
Microsoft	.Net Framework	3.5
Microsoft	.Net Framework	4.7.2
Microsoft	.Net Framework	4.8
Microsoft	.Net Framework	4.8.1
Microsoft	.Net Framework	4.6.2
Microsoft	.Net Framework	4.7
Microsoft	.Net Framework	4.7.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666Vendor Advisory

Timeline

Published: Apr 14, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-23666?

Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.

How severe is CVE-2026-23666?

CVE-2026-23666 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2026-23666?

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-2026-23666?

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

Scan your code now

Source: NVD / NIST