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CVE-2015-1635

99
FAUCET Score

CVE-2015-1635 is a critical remote code execution vulnerability affecting the HTTP.sys component in various Microsoft Windows operating systems, including Windows 7, 8, 8.1, and Server 2008 R2 and 2012. This flaw allows unauthenticated remote attackers to execute arbitrary code by sending specially crafted HTTP requests, posing a severe risk to affected systems. With a CVSS score of 9.8 (CRITICAL), it is easily exploitable over the network with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. The vulnerability is actively exploited in the wild, with public proof-of-concept exploits, Metasploit modules, and Nuclei templates readily available, and has garnered significant community discussion and media attention.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
r2CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:*
r2CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
100.00%
Probability of exploitation in next 30 days
EPSS Percentile
100.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Added to KEV · Feb 10, 2022
Nuclei: CVE-2015-1635 · Nov 23, 2023
ExploitDB: EDB-36776 · Apr 16, 2015
This CVE's current EPSS score of 1.0000 is in the 100th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
packetstormsecurity.com / files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.html
ExploitThird Party AdvisoryVDB Entry
docs.microsoft.com / en-us/security-updates/securitybulletins/2015/ms15-034
PatchVendor Advisory
exploit-db.com / exploits/36773
ExploitThird Party AdvisoryVDB Entry
exploit-db.com / exploits/36776
ExploitThird Party AdvisoryVDB Entry
osvdb.org / 120629
Broken Link
securityfocus.com / bid/74013
Broken LinkThird Party AdvisoryVDB Entry
securitytracker.com / id/1032109
Broken LinkThird Party AdvisoryVDB Entry