{"id":"CVE-2011-4586","aliases":["DSA-2421-1","EUVD-2011-4511","GHSA-5hc2-8542-698w"],"status":"published","title":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before...","description":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.","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":"2026-11-08","score":0.02102,"percentile":0.81844,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2012-02-29T00:00:00Z","modified":"2026-06-16T23:35:05Z","affected":[{"source":"osv","ecosystem":"Debian:6.0","package":"moodle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.9.dfsg2-2.1+squeeze3"}]}],"versions":["1.9.9.dfsg2-2.1","1.9.9.dfsg2-2.1+squeeze1","1.9.9.dfsg2-2.1+squeeze2"],"bundled":11}],"products":[{"vendor":"moodle","product":"moodle"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=761248","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=581e8dba387f090d89382115fd850d8b44351526","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.debian.org/security/2012/dsa-2421","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"]},{"url":"http://moodle.org/mod/forum/discuss.php?d=191754","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4586"},{"url":"http://git.moodle.org/gw?p=moodle.git;a=commit;h=581e8dba387f090d89382115fd850d8b44351526"},{"url":"https://github.com/advisories/GHSA-5hc2-8542-698w"}],"sources":{"cve":[{"id":"CVE-2011-4586","description":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.","status":"published","published":"2012-07-20T10:00:00Z","modified":"2024-08-07T00:09:19.36Z","updated_at":"2026-11-02T14:35:37.671707Z"}],"euvd":[{"id":"EUVD-2011-4511","description":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.","status":"published","published":"2012-07-20T10:00:00Z","modified":"2024-08-07T00:09:19Z","updated_at":"2026-11-03T01:39:48.540824Z"}],"ghsa":[{"id":"GHSA-5hc2-8542-698w","title":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before...","description":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.","status":"published","published":"2022-05-13T01:13:12Z","modified":"2023-02-13T03:30:56Z","updated_at":"2026-11-02T14:54:05.992759Z"}],"nvd":[{"id":"CVE-2011-4586","description":"CRLF injection vulnerability in calendar/set.php in the Calendar subsystem in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.","status":"published","published":"2012-07-20T10:40:35.923Z","modified":"2026-06-16T23:35:05.727Z","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":"2026-11-02T14:02:12.272092Z"}],"osv":[{"id":"DSA-2421-1","title":"moodle - several","status":"published","published":"2012-02-29T00:00:00Z","modified":"2026-03-09T01:18:58.815903Z","updated_at":"2026-11-02T15:46:15.489951Z"}]}}