CVE-2015-1635
CRITICALCISA KEVEPSS 100th pctlDescription
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."
How to fix
Actively exploited, no published fix found yet
CISA required action: Apply updates per vendor instructions.
Federal remediation due: 2022-08-10
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 100% of all known CVEs.
Microsoft HTTP.sys Remote Code Execution Vulnerability
Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.
Apply updates per vendor instructions.
Remediation due: 2022-08-10
References
Related Vulnerabilities
Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2017-9841 | Critical | 9.8 | 100% | KEV | Fix |
| CVE-2025-3248 | Critical | 9.8 | 100% | KEV + Ransom | Fix |
| CVE-2022-22954 | Critical | 9.8 | 100% | KEV + Ransom | - |
| CVE-2021-22204 | Medium | 6.8 | 100% | KEV | Fix |
| CVE-2012-0158 | High | 8.8 | 100% | KEV | - |
| CVE-2022-22963 | Critical | 9.8 | 100% | KEV | - |
Common questions
How do I fix CVE-2015-1635?
No published fix for CVE-2015-1635 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-08-10. Apply the vendor's mitigations per CISA's guidance.
Is CVE-2015-1635 being actively exploited?
Yes. CVE-2015-1635 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-08-10. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2015-1635?
CVE-2015-1635 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.