{"cve":"CVE-2011-5279","nvd":{"published":"2014-04-23T20:55:06.623","modified":"2026-06-16T23:36:16.723","status":"Modified","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_v4":null,"cvss_v3":null,"cwes":[],"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"],"products":["microsoft:internet_information_services"],"source":"nvd","synced_at":"2026-10-19T20:32:06.812358378+00:00"},"epss":{"cve":"CVE-2011-5279","score":0.1959,"percentile":0.97384,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}