{"id":"CVE-2006-2659","aliases":["DEBIAN-CVE-2006-2659","DSA-1101","EUVD-2006-2658","GHSA-jf3h-hc4x-5q33"],"status":"published","title":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU...","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","severity":{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.024,"percentile":0.84133,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2006-05-30T19:00:00Z","modified":"2026-10-22T23:47:22Z","fixes":[{"ecosystem":"Debian:12","package":"courier","fixed_in":["0.53.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"courier","fixed_in":["0.53.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"courier","fixed_in":["0.53.2-1"],"sources":["osv"]},{"ecosystem":"Debian:3.0","package":"courier","fixed_in":["0.37.3-2.9"],"sources":["osv"]},{"ecosystem":"Debian:3.1","package":"courier","fixed_in":["0.47-4sarge5"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.53.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.53.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.53.2-1"}]}]},{"source":"osv","ecosystem":"Debian:3.0","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.37.3-2.9"}]}],"versions":["0.37.3-2.5","0.37.3-2.6","0.37.3-2.7","0.37.3-2.8"]},{"source":"osv","ecosystem":"Debian:3.1","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.47-4sarge5"}]}],"versions":["0.47-4","0.47-4sarge1","0.47-4sarge2","0.47-4sarge3","0.47-4sarge4"]}],"products":[{"vendor":"double_precision_incorporated","product":"courier_mta"}],"references":[{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=368834","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/26998","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://security.gentoo.org/glsa/glsa-200608-06.xml","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","advisory"]},{"url":"http://www.securityfocus.com/bid/18345","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://secunia.com/advisories/20548","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://secunia.com/advisories/20519","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.courier-mta.org/beta/patches/verp-fix/README.txt","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"http://secunia.com/advisories/21350","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.debian.org/security/2006/dsa-1101","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","advisory"]},{"url":"http://www.vupen.com/english/advisories/2006/2214","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","advisory"]},{"url":"https://usn.ubuntu.com/294-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","web"]},{"url":"http://secunia.com/advisories/20792","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://securitytracker.com/id?1016248","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2006-2659"},{"url":"https://usn.ubuntu.com/294-1"},{"url":"https://github.com/advisories/GHSA-jf3h-hc4x-5q33"},{"url":"https://security-tracker.debian.org/tracker/CVE-2006-2659","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2006-2659","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2006-05-30T19:00:00Z","modified":"2024-08-07T17:58:51.858Z","updated_at":"2026-11-02T14:33:49.265317Z"}],"euvd":[{"id":"EUVD-2006-2658","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2006-05-30T19:00:00Z","modified":"2024-08-07T17:58:51Z","updated_at":"2026-11-03T01:16:00.053483Z"}],"ghsa":[{"id":"GHSA-jf3h-hc4x-5q33","title":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU...","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2022-05-01T07:01:12Z","modified":"2025-04-03T04:34:24Z","updated_at":"2026-11-02T15:00:46.038216Z"}],"nvd":[{"id":"CVE-2006-2659","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2006-05-30T19:02:00Z","modified":"2026-06-16T22:25:28.817Z","cvss":[{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:01:03.750605Z"}],"osv":[{"id":"CVE-2006-2659","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2006-05-30T19:02:00Z","modified":"2026-04-10T03:37:35.305631Z","updated_at":"2026-11-02T15:43:56.581247Z"},{"id":"DEBIAN-CVE-2006-2659","description":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is not properly handled during encoding.","status":"published","published":"2006-05-30T19:02:00Z","modified":"2026-10-22T23:47:22.436121945Z","updated_at":"2026-11-02T15:45:23.105674Z"},{"id":"DSA-1101","title":"courier - programming error","status":"published","published":"2006-06-23T00:00:00Z","modified":"2026-03-09T01:00:49.715132Z","updated_at":"2026-11-02T15:46:14.285228Z"}]}}