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CVE Record

CVE-2011-5279: CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services (IIS) 4.x...

CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services (IIS) 4.x and 5.x on Windows NT and Windows 2000 allows remote attackers to modify arbitrary uppercase environment variables via a \n (newline) character in an HTTP header.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2011-5279 is an old IIS CGI issue where crafted HTTP headers could alter server-side environment variables. The sources name IIS 4.x and 5.x on Windows NT and Windows 2000. Business risk is mainly from forgotten legacy systems, not modern supported IIS deployments. Exposure is likely limited to legacy Microsoft IIS 4.x or 5.x servers on Windows NT or Windows 2000 with CGI enabled, especially if internet-facing or reachable from untrusted networks. Treat as a legacy exposure check. It is urgent only if obsolete IIS CGI services are still operating, particularly on public networks or supporting critical workflows. Mitigation focus: Inventory and decommission any Windows NT, Windows 2000, IIS 4.x, or IIS 5.x systems.; Disable CGI on affected legacy IIS servers if it is not required.; Restrict network access to any unavoidable legacy CGI service..

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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1Source links

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Source materials

Affected products

Products and packages named in the record

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Weakness

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