Is CVE-2011-5279 in the CISA KEV catalog?

No. CVE-2011-5279 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-5279?

CVE-2011-5279 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-5279?

CVE-2011-5279 has an EPSS score of 19.09% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-5279

MEDIUMEPSS 97th pctl

5.0

CVSS v2

NVD

Description

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.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

19.09%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

http://hi.baidu.com/yuange1975/item/b2cc7141c22108e91e19bc2e
http://seclists.org/fulldisclosure/2012/Apr/0
http://seclists.org/fulldisclosure/2012/Apr/13
http://seclists.org/fulldisclosure/2014/Apr/108
http://seclists.org/fulldisclosure/2014/Apr/128
http://seclists.org/fulldisclosure/2014/Apr/247

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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 2026-05-06.