CVE-2015-1635

KEVMicrosoft HTTP.sys Remote Code Execution Vulnerability

Description

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

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

PublishedApr 14, 2015

Last modifiedJun 17, 2026

Added to KEVFeb 10, 2022

Remediation dueAug 10, 2022

References

packetstormsecurity.com/files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.htmlExploitThird Party Advisory
osvdb.org/120629Broken Link
securityfocus.com/bid/74013Broken LinkThird Party Advisory
securitytracker.com/id/1032109Broken LinkThird Party Advisory
docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034PatchVendor Advisory
exploit-db.com/exploits/36773/ExploitThird Party Advisory
exploit-db.com/exploits/36776/ExploitThird Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-1635US Government Resource

0 recent articles mention this CVE

Risk assessment · Critical

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1538 days
CVSS: 9.8 CRITICAL
EPSS (30-day exploit probability): 100.0% · top 1% of all CVEs
Weakness: CWE-94
Attack vector: Network, remotely reachable
Preconditions: No privileges and no user interaction

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.