CVE-2015-1635

Name: CVE-2015-1635
Creator: NVD / NIST
Published: 2015-04-14T20:59:01.263+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 100.00%

Last modified Jun 17, 2026

CVE-2015-1635 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.". CISA has confirmed active exploitation in the wild. EPSS estimates a 100.00% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

100.00%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Aug 10, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 7	All versions	Sp1
Microsoft	Windows 8	All versions	—
Microsoft	Windows 8.1	All versions	—
Microsoft	Windows Server 2008	r2	Sp1
Microsoft	Windows Server 2012	All versions	—
Microsoft	Windows Server 2012	r2	—

References

http://packetstormsecurity.com/files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.htmlExploit, Third Party Advisory, VDB Entry
http://www.osvdb.org/120629Broken Link
http://www.securityfocus.com/bid/74013Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1032109Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034Patch, Vendor Advisory
https://www.exploit-db.com/exploits/36773/Exploit, Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/36776/Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.htmlExploit, Third Party Advisory, VDB Entry
http://www.osvdb.org/120629Broken Link
http://www.securityfocus.com/bid/74013Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1032109Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034Patch, Vendor Advisory
https://www.exploit-db.com/exploits/36773/Exploit, Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/36776/Exploit, Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-1635US Government Resource

Timeline

Published: Apr 14, 2015
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2015-1635?

How severe is CVE-2015-1635?

CVE-2015-1635 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 100.00% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2015-1635?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-1635?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST