Microsoft HTTP.sys Remote Code Execution Vulnerability

Exploited · KEV 2022-02-10Metasploit moduleCVE-2015-1635CWE-94

Exploited since 2022-02-10. No WAF vendor names it yet. Our CRS test: not blocked.

Edge rules

0/8

Our test

Not blocked

CVSS

9.8

EPSS

100.0% Top 0.1%

Posts, 14d

Published

2015-04-14

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."

Edge coverage

Claimed by vendors

CloudflareBefore feed historyOlder than its feedEnterprise: blocked · Free: passed AWSBefore feed historyOlder than its feedWe measured: passed Microsoft AzureNo public claimNot named Google CloudBefore feed historyOlder than its feedWe measured: passed FastlyBefore feed historyOlder than its feed F5Before feed historyOlder than its feed AkamaiNo public sourceNo public changelog OWASP CRSBefore feed historyOlder than its feed

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AI · answers from this page

Ask about CVE-2015-1635: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

Workers AI (Llama 3.3). Can be wrong: check the cited source.

Severity, decoded

CVSS 3.1

9.8Critical

Critical · 9.8 / 10

Exploitable over the network, with no privileges and no user interaction, leading to full loss of confidentiality, integrity and availability.

Over the internetNo login neededNo user actionWorks reliablyFull compromise

How the score is built8 metrics

Attack vectorAn attacker can reach it over the internet; no access to your network needed.
Network
Attack complexityNo special conditions are needed; the attack works reliably.
Low
Privileges requiredNo account or login is needed.
None
User interactionNo one has to click or open anything; the attack works on its own.
None
ScopeThe damage stays within the vulnerable component.
Unchanged
Confidentiality impactAn attacker can read all data the affected component holds, or the most sensitive parts of it.
High
Integrity impactAn attacker can change any data or files the affected component protects.
High
Availability impactAn attacker can take the component down completely or keep it from serving anyone.
High

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

CISA's assessmentSSVC, from the CVE record

ExploitationActive

Attackers are exploiting this in the wild.

AutomatableYes

Attackers can script the attack end to end and hit many targets at once.

Technical impactTotal

A successful attack gives full control over the affected software or all of its data.

Public exploits

5 found

2 Metasploit2 Exploit-DB1 Scanner template0 GitHub PoCs

MetasploitMS15-034 HTTP Protocol Stack Request Handling Denial-of-Serviceauxiliary · rank Normal · has check
MetasploitMS15-034 HTTP Protocol Stack Request Handling HTTP.SYS Memory Information Disclosureauxiliary · rank Normal · has check
Exploit-DBMicrosoft Windows - 'HTTP.sys' HTTP Request Parsing Denial of Service (MS15-034)2015-04-16 · dos · windows
Exploit-DBMicrosoft Windows - 'HTTP.sys' (PoC) (MS15-034)2015-04-15 · dos · windows
NucleiCVE-2015-1635.yamldetection template, replayed in our lab

Links are to third-party code: never run it outside an isolated lab.

Timeline

2015-04-14
CVE published
CVE List
2015-04-15
Exploit published on Exploit-DB
Microsoft Windows - 'HTTP.sys' (PoC) (MS15-034)
2022-02-10
Added to CISA KEV
Confirmed exploitation in the wild
2026-11-02
Our test: OWASP Core Rule Set let it through
paranoia level 1, anomaly threshold 5, default CRS settings
2026-11-02
Our test: OWASP Core Rule Set let it through
paranoia level 2, anomaly threshold 5, default CRS settings