CVE-2023-36873: .NET Framework Spoofing Vulnerability

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-08 · updated 2026-08-10
Weakness: CWE-20

Description

.NET Framework Spoofing Vulnerability

Affected products

Microsoft .NET Framework: 4.6.2, 3.5, 4.8.1, 4.7, 4.7.1, 4.7.2 (+1)
Microsoft .NET Framework 3.5 and 4.6.2: from 4.7.0 before 10.0.10240.20107 — fixed in 10.0.10240.20107
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0 before 10.0.14393.6167 — fixed in 10.0.14393.6167
Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 3.5.04057.05 — fixed in 3.5.04057.05
Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 3.5.4654.08 — fixed in 3.5.4654.08
Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 3.5.09176.01 — fixed in 3.5.09176.01
Microsoft .NET Framework 4.6.2: from 4.7.0 before 4.7.04057.05 — fixed in 4.7.04057.05
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.7.04057.05 — fixed in 4.7.04057.05
Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.4654.06 — fixed in 4.8.4654.06

How to fix

Upgrade to a fixed version: Microsoft .NET Framework 3.5 and 4.6.2 10.0.10240.20107; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 10.0.14393.6167; Microsoft .NET Framework 3.5 AND 4.7.2 3.5.04057.05; Microsoft .NET Framework 3.5 AND 4.8 3.5.4654.08; Microsoft .NET Framework 3.5 AND 4.8.1 3.5.09176.01; Microsoft .NET Framework 4.6.2 4.7.04057.05; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.04057.05; Microsoft .NET Framework 4.8 4.8.4654.06. Check the vendor advisory for mitigations.

References

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