CVE-2023-36435: Microsoft QUIC Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2023-Oct

Released

2023-10-10

Last Updated

2024-12-10

EPSS Score

2.84% (percentile: 86.2%)

FAQ

Where can I find more information? Please see the GitHub Advisory relating to this vulnerability here: https://github.com/microsoft/msquic/security/advisories/GHSA-fr44-546p-7xcp#event-111622

Affected Products (8)

Developer Tools

• PowerShell 7.3
• .NET 7.0

Windows

• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 11 version 21H2 for x64-based Systems
• Windows 11 version 21H2 for ARM64-based Systems
• Windows 11 Version 22H2 for ARM64-based Systems
• Windows 11 Version 22H2 for x64-based Systems

Security Updates (5)

• Release Notes
• 5031364
• 5031358
• 5031354
• 5032875

Acknowledgments

<a href="https://twitter.com/ezrak1e">ziming zhang</a> with Ant Security Light-Year Lab, <a href="https://twitter.com/ezrak1e">ziming zhang</a> with Ant Security Light-Year Lab

Revision History

• 2023-10-10: Information published.
• 2023-10-26: Revised the Security Updates table to include PowerShell 7.3 because this version of PowerShell 7 is affected by this vulnerability. See https://github.com/PowerShell/Announcements/issues/52 for more information.
• 2024-12-10: To comprehensively address CVE-2023-36435, Microsoft has released security updates on October 24, 2023 for .NET 7.0. Microsoft recommends that customers running .NET install the updates to be fully protected from the vulnerability.