{"id":"CVE-2011-5279","aliases":["EUVD-2011-5178","GHSA-qgmx-m7r8-pq37"],"status":"published","title":"CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services...","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.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.1959,"percentile":0.974,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2014-04-23T20:00:00Z","modified":"2026-06-16T23:36:16Z","products":[{"vendor":"microsoft","product":"internet_information_services"}],"references":[{"url":"http://seclists.org/fulldisclosure/2014/Apr/247","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2014/Apr/128","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2012/Apr/0","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2014/Apr/108","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"http://hi.baidu.com/yuange1975/item/b2cc7141c22108e91e19bc2e","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2012/Apr/13","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-5279"},{"url":"https://github.com/advisories/GHSA-qgmx-m7r8-pq37"}],"sources":{"cve":[{"id":"CVE-2011-5279","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.","status":"published","published":"2014-04-23T20:00:00Z","modified":"2024-08-07T00:30:46.943Z","updated_at":"2026-11-02T14:35:36.252742Z"}],"euvd":[{"id":"EUVD-2011-5178","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.","status":"published","published":"2014-04-23T20:00:00Z","modified":"2024-08-07T00:30:46Z","updated_at":"2026-11-03T01:39:47.222761Z"}],"ghsa":[{"id":"GHSA-qgmx-m7r8-pq37","title":"CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services...","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.","status":"published","published":"2022-05-13T01:13:24Z","modified":"2023-02-01T05:04:16Z","updated_at":"2026-11-02T14:50:08.411477Z"}],"nvd":[{"id":"CVE-2011-5279","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.","status":"published","published":"2014-04-23T20:55:06.623Z","modified":"2026-06-16T23:36:16.723Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:02:12.639283Z"}]}}