CVE-2015-1635
CriticalExploitedPublic exploitHTTP.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."
Published Apr 14, 2015 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2015-1635 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Windows 7 (Microsoft), Windows 8 (Microsoft), Windows 8.1 (Microsoft) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 12, 2021. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2015-1635 brief as a PDF
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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."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 10, 2022 | Aug 10, 2022 | Not reported |
| Industry KEV feed | Apr 12, 2021 | Aug 10, 2022 | Not reported |
| CIRCL KEV | Feb 10, 2022 | Aug 10, 2022 | Not reported |
| ENISA EUVD | Feb 10, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
7 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 7Microsoft | See advisory | n/a |
| Windows 8Microsoft | See advisory | n/a |
| Windows 8.1Microsoft | See advisory | n/a |
| Windows Server 2008Microsoft | r2-sp1 | n/a |
| Windows Server 2012Microsoft | r2 | n/a |
Timeline
Publicly disclosed
Apr 14, 2015
Added to Industry KEV feed
Apr 12, 2021
Added to CISA KEV
Feb 10, 2022
Added to CIRCL KEV
Feb 10, 2022
Added to ENISA EUVD
Feb 10, 2022
Last updated
Apr 22, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisory74013
- advisory1032109
- patchMS15-034
- exploithttp://packetstormsecurity.com/files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.html
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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."
Affected: Windows 7 (Microsoft); Windows 8 (Microsoft); Windows 8.1 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 12, 2021.
Yes. It was added on Feb 10, 2022 with a federal remediation due date of Aug 10, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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