CVE-2015-1635

Microsoft HTTP.sys Remote Code Execution

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 100.0%

Published14 Apr 2015
Added to CISA KEV10 Feb 2022
Remediation due10 Aug 2022

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 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Microsoft Windows 7all versions

Microsoft Windows 8all versions

Microsoft Windows 8.1all versions

Microsoft Windows Server 2008r2

Microsoft Windows Server 2012r2

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Patch & vendor advisories

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034

References

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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2015-1635 being actively exploited?

Yes. CVE-2015-1635 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Feb 2022.

How severe is CVE-2015-1635?

CVE-2015-1635 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2015-1635?

Affected products include Microsoft Windows 7, Microsoft Windows 8, Microsoft Windows 8.1, Microsoft Windows Server 2008, Microsoft Windows Server 2012.

How do I fix CVE-2015-1635?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2015-1635 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.