CVE-2026-23666

HIGH

Microsoft .NET Framework - Input Validation Denial of Service

Title source: manual
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
.NET Framework Denial of Service Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666

Scores

CVSS v3 7.5
EPSS 0.0103
EPSS Percentile 59.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-755
Status published
Products (13)
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
Microsoft/Microsoft .NET Framework 3.5 3.5.0 - 2.0.50727.8982 & 3.0.30729.8976
Microsoft/Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 - 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0
Microsoft/Microsoft .NET Framework 3.5 AND 4.8 4.8.0 - 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0
... and 3 more
Published Apr 14, 2026
Tracked Since Apr 14, 2026