Microsoft HTTP.sys Remote Code Execution Vulnerability

Added to KEV
2022-02-10
Federal due date
2022-08-10
Vendor
Microsoft
Product
HTTP.sys
EPSS
100.0th percentile (score 0.943, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2015-1635

CISA short description

Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.