CVE-2025-55248: .NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability

Severity: medium (CVSS 5.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-14 · updated 2026-06-17
Weakness: CWE-326

Description

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

Affected products

Microsoft .NET: from 8.0.0 before 8.0.21; from 9.0.0 before 9.0.10 — fixed in 8.0.21, 9.0.10
Microsoft .NET Framework: 4.6.2, 4.7, 4.7.1, 4.7.2, 3.5.1, 3.5 (+3)
Microsoft Visual Studio 2022 version 17.14: from 17.10.0 before 17.10.20; from 17.12.0 before 17.12.13; from 17.14.0 before 17.14.17 — fixed in 17.10.20, 17.12.13, 17.14.17
Microsoft .NET 8.0: from 8.0.0 before 8.0.21 — fixed in 8.0.21
Microsoft .NET 9.0: from 9.0.0 before 9.0.10 — fixed in 9.0.10
Microsoft .NET Framework 2.0 Service Pack 2: from 2.0.0 before 2.0.50727.8981 — fixed in 2.0.50727.8981
Microsoft .NET Framework 3.0 Service Pack 2: from 3.0.0 before 2.0.50727.8981 — fixed in 2.0.50727.8981
Microsoft .NET Framework 3.5: from 3.5.0 before 2.0.50727.8981 — fixed in 2.0.50727.8981
Microsoft .NET Framework 3.5.1: from 3.5.0 before 2.0.50727.8981 — fixed in 2.0.50727.8981
Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 4.7.04137.03 — fixed in 4.7.04137.03
Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 4.8.04798.02 — fixed in 4.8.04798.02
Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 4.8.1.09320.02 — fixed in 4.8.1.09320.02
Microsoft .NET Framework 4.6.2: from 4.7.0 before 4.7.04137.03 — fixed in 4.7.04137.03
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.7.04137.03 — fixed in 4.7.04137.03
Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.04798.02 — fixed in 4.8.04798.02
Microsoft Visual Studio 2022 version 17.10: from 17.10.0 before 17.10.20 — fixed in 17.10.20
Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.13 — fixed in 17.12.13

How to fix

Upgrade to a fixed version: Microsoft .NET 8.0.21, 9.0.10; Microsoft Visual Studio 2022 version 17.14 17.10.20, 17.12.13, 17.14.17; Microsoft .NET 8.0 8.0.21; Microsoft .NET 9.0 9.0.10; Microsoft .NET Framework 2.0 Service Pack 2 2.0.50727.8981; Microsoft .NET Framework 3.0 Service Pack 2 2.0.50727.8981; Microsoft .NET Framework 3.5 2.0.50727.8981; Microsoft .NET Framework 3.5.1 2.0.50727.8981; Microsoft .NET Framework 3.5 AND 4.7.2 4.7.04137.03; Microsoft .NET Framework 3.5 AND 4.8 4.8.04798.02; Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1.09320.02; Microsoft .NET Framework 4.6.2 4.7.04137.03. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55248

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