CVE-2022-35748: HTTP.sys 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

More Likely

Patch Tuesday

2022-Aug

Released

2022-08-09

EPSS Score

47.41% (percentile: 97.7%)

FAQ

How could an attacker exploit this vulnerability? In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the Server Name Indication (SNI) over HTTP Protocol Stack (http.sys) to process packets, causing a denial of service (DOS).

Affected Products (11)

Windows

• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server, version 20H2 (Server Core Installation)
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (8)

• 5016623
• 5016627
• 5016616
• 5016622
• 5016672
• 5016684
• 5016681
• 5016683

Acknowledgments

<a href="https://www.youtube.com/watch?v=0AhPC_dHkHo">Polar Bear</a>

Revision History

• 2022-08-09: Information published.