CVE-2026-32177: .NET Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.3)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-May

Released

2026-05-12

Description

Heap-based buffer overflow in .NET allows an unauthorized attacker to elevate privileges locally.

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain ELEVATED privileges. According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and integrity (I:H), and some loss of availability (A:L). What does that mean for this vulnerability? An attacker who successfully exploited this vulnerability could view sensitive information (Confidentiality) and modify code in the repo, (Integrity), and they might be able to interfere with availability of the code (Availability). According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? Exploitation of this vulnerability requires that a user trigger the payload in the application. According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and integrity (I:H), and some loss of availability (A:L). What does that mean for this vulnerability? An attacker who successfully exploited this vulnerability could view sensitive information such as other user's credentials (Confidentiality) and make changes to file contents on the target server (Integrity), and they might be able to force a crash (Availability).

Affected Products (30)

Developer Tools

• .NET 10.0 installed on Windows
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
• Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)
• Microsoft Visual Studio 2022 version 17.12
• Microsoft Visual Studio 2022 version 17.14
• Microsoft Visual Studio 2026 version 18.5
• Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
• Microsoft .NET Framework 4.8 on Windows Server 2012
• Microsoft .NET Framework 4.8 on Windows Server 2012 R2
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems
• Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 22H2 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
• Microsoft .NET Framework 3.5 on Windows Server 2012
• Microsoft .NET Framework 3.5 on Windows Server 2012 R2

Security Updates (25)

• 5093446
• 5093447
• 5093448
• Release Notes
• Release Notes
• Release Notes
• Release Notes
• Release Notes
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Acknowledgments

Ky0toFu

Revision History

• 2026-05-12: Information published.