ExploitedIn CISA KEVFix available

CVE-2015-1635

Exploitation confirmed. First attested on 2022-02-10 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2015-04-14
WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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."

Timeline

dates in UTC

2015-04-1420:59CVE publishedNVD
2022-02-10Listed as exploited by GCVEGCVE
2022-02-10Exploitation first reportedCISA KEV
2022-02-10Added to the CISA KEV catalogCISA KEV
2025-02-1021:15SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-1635?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-1635?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft windows server 2012

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD
—	= r2	no fix published	NVD

Microsoft windows 7

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Microsoft windows 8

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSMA-17-215-02 CISA1 known affected
ICSMA-17-215-02_Siemens Molecular Imaging Vulnerabilities
Siemens PET/CT Systems: All Windows 7-based versions

Full record on NVD

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-08-10
Mitigation from the vendor CISA ICSMA-17-215-02 · 4 productsIn addition, Siemens recommends:

Advisories and patches

docs.microsoft.comPatch · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: EDB-36773 EDB-36776
Proof-of-concept repositories: 13 repositories, unverifiedZx7ffa4512-Python/Project-CVE-2015-1635technion/erlvulnscanhedgecore/HTTPsyswiredaem0n/chk-ms15-034u0pattern/Remove-IIS-RIIS

CISA Known Exploited Vulnerability

Date Added: 2022-02-10
Patch Due Date: 2022-08-10
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-02-10
GCVEexploitation2022-02-10
CISA-ADPSSVC decisionactive2025-02-10
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.19.82025-02-10
NVDCVSS 2.010read 2026-10-23
CISA-ADPweakness (CWE)CWE-942025-02-10
NVDweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score99.9 %read 2026-10-23
PoC-in-GitHubproof of concept13read 2026-10-23
Exploit-DBdetectionread 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2015-04-14
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2015-1635?

Is CVE-2015-1635 actively exploited?

Yes. CVE-2015-1635 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-08-10.

What is the CVSS score for CVE-2015-1635?

CVE-2015-1635 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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