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CVE-2015-1635

CRITICAL9.8
CISA KEV

Published 2015-04-14 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2015-1635 is a critical-severity (CVSS 9.8) vulnerability in Microsoft HTTP.sys. CISA added it to the Known Exploited Vulnerabilities catalog on February 10, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by August 10, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, and Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted HTTP requests, aka "HTTP.sys Remote Code Execution Vulnerability."

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

CWE-94CWE-94

CISA Known-Exploited Vulnerability

Product: Microsoft — HTTP.sys

Name: Microsoft HTTP.sys Remote Code Execution Vulnerability

Date added: 2022-02-10 · Due: 2022-08-10

Required action: Apply updates per vendor instructions.

View on NVD