CVE-2017-7269
Published: November 3, 2021
Official Description
Microsoft Windows Server 2003 R2 contains a buffer overflow vulnerability in Internet Information Services (IIS) 6.0 which allows remote attackers to execute code via a long header beginning with "If: <http://" in a PROPFIND request.
CISA KEV Advisory
Microsoft Windows Server Buffer Overflow Vulnerability
Microsoft Windows Server 2003 R2 contains a buffer overflow vulnerability in Internet Information Services (IIS) 6.0 which allows remote attackers to execute code via a long header beginning with "If: <http://" in a PROPFIND request.
Apply updates per vendor instructions.
Risk Analysis
Microsoft Windows Server 2003 R2's Internet Information Services (IIS) 6.0 contains a buffer overflow vulnerability. This flaw allows remote attackers to execute arbitrary code by sending a specially crafted PROPFIND request with a long 'If:' header. The high EPSS score of 0.94411 indicates a very high likelihood of exploitation, making this a critical vulnerability.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog, confirming its confirmed exploitation. The remote code execution capability makes it a severe threat.
Upgrade from Windows Server 2003 R2 to a supported operating system, as it is end-of-life. If immediate upgrade is not possible, restrict network access to IIS 6.0 and apply any available workarounds.
Technical Analysis
CVE-2017-7269 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-2017-7269 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-2017-7269 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