{"id":"CVE-2011-2943","aliases":["DEBIAN-CVE-2011-2943","EUVD-2011-2911","GHSA-39wr-cgvv-f2w7"],"status":"published","title":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in...","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.03596,"percentile":0.89524,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2011-08-29T17:00:00Z","modified":"2026-10-23T17:47:33Z","fixes":[{"ecosystem":"Debian:12","package":"pidgin","fixed_in":["2.10.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"pidgin","fixed_in":["2.10.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"pidgin","fixed_in":["2.10.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"pidgin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"pidgin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"pidgin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.0-1"}]}]}],"products":[{"vendor":"pidgin","product":"libpurple"},{"vendor":"pidgin","product":"pidgin"}],"references":[{"url":"http://pidgin.im/news/security/?id=53","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"http://developer.pidgin.im/viewmtn/revision/info/5c2dba4a7e2e76b76e7f472b88953a4316706d43","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"http://www.openwall.com/lists/oss-security/2011/08/22/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://secunia.com/advisories/45663","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18005","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred","web"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/69340","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://secunia.com/advisories/45916","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=722939","tags":["x_refsource_CONFIRM","x_transferred","report"]},{"url":"http://www.securityfocus.com/bid/49268","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://developer.pidgin.im/viewmtn/revision/diff/5749f9193063800d27bef75c2388f6f9cc2f7f37/with/5c2dba4a7e2e76b76e7f472b88953a4316706d43/libpurple/protocols/irc/msgs.c","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"http://securitytracker.com/id?1025961","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2011/08/20/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-2943"},{"url":"https://github.com/advisories/GHSA-39wr-cgvv-f2w7"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-2943","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-2943","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2011-08-29T17:00:00Z","modified":"2024-08-06T23:15:32.003Z","updated_at":"2026-11-02T14:35:36.968002Z"}],"euvd":[{"id":"EUVD-2011-2911","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2011-08-29T17:00:00Z","modified":"2024-08-06T23:15:32Z","updated_at":"2026-11-03T01:39:53.544801Z"}],"ghsa":[{"id":"GHSA-39wr-cgvv-f2w7","title":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in...","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2022-05-17T01:00:56Z","modified":"2023-02-03T05:02:59Z","updated_at":"2026-11-02T14:53:16.686347Z"}],"nvd":[{"id":"CVE-2011-2943","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2011-08-29T17:55:00.957Z","modified":"2026-06-16T23:32:18.063Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:02:09.988332Z"}],"osv":[{"id":"CVE-2011-2943","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2011-08-29T17:55:00Z","modified":"2026-04-10T03:41:55.270406Z","updated_at":"2026-11-02T15:43:58.279353Z"},{"id":"DEBIAN-CVE-2011-2943","description":"The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.","status":"published","published":"2011-08-29T17:55:00.957Z","modified":"2026-10-23T17:47:33.757727306Z","updated_at":"2026-11-02T15:45:24.612044Z"}]}}