CVE-2015-1635
Published: February 10, 2022
Official Description
Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.
CISA KEV Advisory
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.
Risk Analysis
The Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution. The high EPSS score of 0.94310 indicates a very high likelihood of this vulnerability being exploited, making it a critical issue.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog, confirming its confirmed exploitation. The nature of the flaw suggests it is remotely exploitable.
Administrators should apply all available security updates for Microsoft HTTP.sys. Ensure systems are regularly patched and consider network segmentation to limit exposure.
Technical Analysis
CVE-2015-1635 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2015-1635 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-1635 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1