CVE-2022-35748: 
vulnerability analysis and mitigation

HTTP.sys Denial of Service Vulnerability (CVE-2022-35748) is a security flaw discovered in Microsoft Windows HTTP Protocol Stack (http.sys). The vulnerability was disclosed in August 2022 and affects multiple versions of Microsoft Windows Server, including Server 2012, 2012 R2, 2016, 2019, and 2022 (Microsoft Advisory).

The vulnerability exists in the HTTP 2.0 protocol stack (HTTP.sys) and is related to how the system processes Server Name Indication (SNI) packets. Microsoft has assigned this vulnerability a CVSS base score of 7.5 HIGH with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (NVD).

An unauthenticated attacker could exploit this vulnerability by sending specially crafted packets to a targeted server utilizing the Server Name Indication (SNI) over HTTP Protocol Stack (http.sys), resulting in a denial of service condition that could make the system unresponsive (Qualys Research).

Microsoft has released security updates to address this vulnerability. The fixes are available through various KB articles including KB5016616, KB5016622, KB5016623, KB5016627, KB5016672, KB5016681, KB5016683, and KB5016684. Organizations are advised to apply these patches as soon as possible (Microsoft Advisory).