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Home > Cybersecurity > Microsoft patches a wormable vulnerability

Microsoft patches a wormable vulnerability

Microsoft has patched a critical wormable flaw that was discovered in the HTTP Protocol Stack, HTTP.sys.


Erdem Yasar Erdem Yasar
January 12, 2022
1 min read
Microsoft patches a wormable vulnerability

The Microsoft team patched a flaw that impacts the Windows desktop and server versions, including Windows 11 and Windows Server 2022. The vulnerability, tracked as CVE-2022-21907 is a critical flaw and also tagged as wormable. The flaw was found in the HTTP.sys (HTTP Protocol Stack) which is a protocol listener by the Windows Internet Information Services web server.

Patch and mitigation

To exploit the vulnerability, an authorized third party can send maliciously crafted packets to Windows servers that uses the HTTP Protocol Stack for processing packets. It allows attackers to remotely execute arbitrary code in low complexity attacks without requiring user interaction in most situations.

Microsoft patched the vulnerability, which has a CVSS score of 9.8, in this month’s Patch Tuesday. The tech giant urged users to apply the patch as soon as possible. There aren’t any proof of concepts published publicly yet and the vulnerability isn’t under active exploitation.

Microsoft also published mitigation for the flaw. In Windows Server 2019 and Windows 10 version 1809, the HTTP Trailer Support feature that contains the vulnerability is not active by default. The following registry key must be configured to introduce the vulnerable condition:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters\

"EnableTrailerSupport"=dword:00000001

This mitigation does not apply to the other affected versions.

See more Cybersecurity News


Tags: MicrosoftVulnerability
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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