CVE-2015-1635 — Microsoft
CRITICALCVE-2015-1635 is a critical-severity (CVSS 9.8) Code Injection vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-02-10) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
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…
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-02-10. Federal agencies were required to remediate by 2022-08-10.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2015-1635.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2015-1635 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 396,257 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
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."
Affected Products
windows 7microsoftwindows 8microsoftwindows 8.1microsoftwindows server 2008microsoftwindows server 2012microsoftResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Microsoft Windows - 'HTTP.sys' (PoC) (MS15-034)
by rhcp011235 · Apr 15, 2015
Microsoft Windows - 'HTTP.sys' HTTP Request Parsing Denial of Service (MS15-034)
by laurent gaffie · Apr 16, 2015
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2015-1635 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
How to detect CVE-2015-1635
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2015-1635 -u https://target- Template
- Microsoft Windows 'HTTP.sys' - Remote Code Execution
- Severity
- critical
- Impact
- Attackers can execute arbitrary code remotely on Windows servers running vulnerable HTTP.sys, potentially leading to complete system compromise and data breach.
- Remediation
- Apply Microsoft security update MS15-034 immediately to patch the vulnerability.
Template by ProjectDiscovery nuclei-templates (Phillipo), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2015-1635 in your dependencies?
Find it across , including transitive dependencies.