# CVE-2015-1635: Microsoft HTTP.sys Remote Code Execution Vulnerability

Source: https://junglewise.ai/threats/cve-2015-1635-microsoft-http-sys-remote-code-execution-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-02-10. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2015-1635 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-02-10

The HTTP protocol stack (HTTP.sys) in multiple Microsoft Windows operating systems allows remote attackers to execute arbitrary code via specially crafted HTTP requests. This vulnerability is caused by improper control of generation of code (code injection) within the stack.

Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2015-1635 exploited in the wild?** Yes. CVE-2015-1635 is known to be exploited in the wild, first recorded on 10 February 2022. Treat it as urgent.

**How severe is CVE-2015-1635?** Critical severity, with a CVSS score of 9.8, published 10 February 2022.

**Which products and versions are affected?** Microsoft Windows 7 SP1; Microsoft Windows Server 2008 R2 SP1; Microsoft Windows 8; Microsoft Windows 8.1; and 1 more.

**Is there a fix for CVE-2015-1635?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2015-1635 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2015-1635?** Check whether you run Microsoft HTTP.sys. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft Windows 7 SP1
- Microsoft Windows Server 2008 R2 SP1
- Microsoft Windows 8
- Microsoft Windows 8.1
- Microsoft Windows Server 2012 Gold and R2

## Timeline

- 2015-04-14: advisory: Microsoft Security Bulletin MS15-034 published.
- 2022-02-10: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
- 2022-02-10: disclosed: NVD publication date.
- 2022-08-10: other: CISA due date for remediation.