CVE-2021-26442

HighCVSS 7.0/10Last modified Jun 17, 2026

Description

Windows HTTP.sys Elevation of Privilege Vulnerability

Metrics

CVSS 3.1 7.0/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
MicrosoftWindows 10 Version 1809>= 10.0.0, < 10.0.17763.2237
MicrosoftWindows Server 2019>= 10.0.0, < 10.0.17763.2237
MicrosoftWindows Server 2019 (Server Core installation)>= 10.0.0, < 10.0.17763.2237
MicrosoftWindows 10 Version 1909>= 10.0.0, < 10.0.18363.1854
MicrosoftWindows 10 Version 21H1>= 10.0.0, < 10.0.19043.1288
MicrosoftWindows Server 2022>= 10.0.0, < 10.0.20348.288
MicrosoftWindows 10 Version 2004>= 10.0.0, < 10.0.19041.1288
MicrosoftWindows Server version 2004>= 10.0.0, < 10.0.19041.1288
MicrosoftWindows 10 Version 20H2>= 10.0.0, < 10.0.19042.1288
MicrosoftWindows Server version 20H2>= 10.0.0, < 10.0.19042.1288
MicrosoftWindows 11 version 21H2>= 10.0.0, < 10.0.22000.258
MicrosoftWindows 10 Version 1507>= 10.0.0, < 10.0.10240.19086
MicrosoftWindows 10 Version 1607>= 10.0.0, < 10.0.14393.4704
MicrosoftWindows Server 2016>= 10.0.0, < 10.0.14393.4704
MicrosoftWindows Server 2016 (Server Core installation)>= 10.0.0, < 10.0.14393.4704
MicrosoftWindows 7>= 6.1.0, < 6.1.7601.25740
MicrosoftWindows 7 Service Pack 1>= 6.1.0, < 6.1.7601.25740
MicrosoftWindows 8.1>= 6.3.0, < 6.3.9600.20144
MicrosoftWindows Server 2008 Service Pack 2>= 6.0.0, < 6.0.6003.21251
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)>= 6.0.0, < 6.0.6003.21251
MicrosoftWindows Server 2008 Service Pack 2>= 6.0.0, < 6.0.6003.21251
MicrosoftWindows Server 2008 R2 Service Pack 1>= 6.1.0, < 6.1.7601.25740
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)>= 6.0.0, < 6.1.7601.25740
MicrosoftWindows Server 2012>= 6.2.0, < 6.2.9200.23490
MicrosoftWindows Server 2012 (Server Core installation)>= 6.2.0, < 6.2.9200.23490
MicrosoftWindows Server 2012 R2>= 6.3.0, < 6.3.9600.20144
MicrosoftWindows Server 2012 R2 (Server Core installation)>= 6.3.0, < 6.3.9600.20144

References

Timeline

Published
Oct 13, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-264439.0Microsoft Virtual Machine Bus (VMBus) Remote Code Execution VulnerabilityCVE-2021-264443.3Azure RTOS Information Disclosure VulnerabilityCVE-2021-264619.8Apache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory CVE-2021-264719.8In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1, the http API located at /sgwebservice_o.php accepts a command argument. Using CVE-2021-264729.8In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 installed on Windows, the http API located at /consumerweb/secure/download.php.CVE-2021-264739.8In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 the http API located at /sgwebservice_o.php action logFilePath allows an attackCVE-2021-264748.8Various Vembu products allow an attacker to execute a (non-blind) http-only Cross Site Request Forgery (Other products or versions of producCVE-2021-264756.1EPrints 3.4.2 exposes a reflected XSS opportunity in the via a cgi/cal URI.CVE-2021-264769.8EPrints 3.4.2 allows remote attackers to execute OS commands via crafted LaTeX input to a cgi/cal?year= URI.CVE-2021-265047.5Directory Traversal vulnerability in Foddy node-red-contrib-huemagic version 3.0.0, allows remote attackers to gain sensitive information viCVE-2021-265059.8Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extCVE-2021-265289.1The mg_http_serve_file function in Cesanta Mongoose HTTP server 7.0 is vulnerable to remote OOB write attack via connection request after ex
CVE-2021-26442: High severity, CVSS 7.0 | Vulnix