What is the HTTP.sys Remote Code Execution vulnerability (CVE-2022-21907)

What is the HTTP vulnerability CVE-2022-21907

Sep 19, 2022

7 min read

Sudip Sengupta

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The Remote Code Execution Vulnerability (RCE) is a security vulnerability exploited by malicious users to run arbitrary code on a compromised server/computer. A remote code execution attack is typically aimed at gaining system-level privileges and administrative access to a public-facing application, giving the unauthenticated attacker visibility of the server’s stack trace and the ability to interrupt user interaction. Identified as CVE-2022-21907 HTTP vulnerability, the CVE database attributes RCE as a vulnerability with severe impacts.

This article discusses various causes, impacts, and remediation options of the CVE-2022-21907 HTTTP vulnerability.

What is CVE-2022-21907?

The Common Vulnerabilities and Exposures (CVE) database provides a reference for publicly discovered security weaknesses and vulnerabilities. The database catalogs knew cybersecurity flaws, helping DevSecOps teams coordinate their efforts to address these vulnerabilities to keep networks secure. 

HTTP Protocol Stack Remote Code Execution (CVE-2022-21907) is a class of critical RCE vulnerabilities affecting applications relying on Microsoft’s Internet Information Services (IIS) component. Attacks are exploiting this vulnerability target the kernel module within the HTTP.sys web server, leading to a Denial of Service (DoS) attack by freezing the OS. Besides being a DoS attack vector, the vulnerability allows malicious actors to craft a malformed request and perform remote code execution to gain elevated privileges for accessing binary files, network stack

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