{"id":"CVE-2009-1959","aliases":["DEBIAN-CVE-2009-1959","EUVD-2009-1954","GHSA-2v73-9rwq-75qc","openSUSE-SU-2024:10455-1"],"status":"published","title":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13...","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.08385,"percentile":0.95013,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-189"],"published":"2009-06-06T18:00:00Z","modified":"2026-10-23T17:47:51Z","exploits":[{"source":"exploitdb","id":"EDB-33041","title":"Irssi 0.8.13 - 'WALLOPS' Message Off-by-One Heap Memory Corruption","type":"dos","platform":"linux","date":"2009-05-15","verified":true,"url":"https://www.exploit-db.com/exploits/33041"}],"fixes":[{"ecosystem":"Debian:12","package":"irssi","fixed_in":["0.8.13-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"irssi","fixed_in":["0.8.13-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"irssi","fixed_in":["0.8.13-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"irssi","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.13-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"irssi","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.13-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"irssi","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.13-2"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"irssi","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.20-3.1"}]}],"bundled":6}],"products":[{"vendor":"irssi","product":"irssi"}],"references":[{"url":"http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/","tags":["x_refsource_MISC","x_transferred","Exploit","evidence"]},{"url":"http://www.securitytracker.com/id?1022410","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2009/05/29/3","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/35399","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://www.irssi.org/ChangeLog","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","evidence"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"http://bugs.irssi.org/index.php?do=details\u0026task_id=662","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","evidence"]},{"url":"http://secunia.com/advisories/35685","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.vupen.com/english/advisories/2009/1596","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://www.ubuntu.com/usn/usn-800-1","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","advisory"]},{"url":"http://secunia.com/advisories/35812","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:133","tags":["vendor-advisory","x_refsource_MANDRIVA","x_transferred","advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/51184","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://secunia.com/advisories/36152","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1959"},{"url":"http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite"},{"url":"https://github.com/advisories/GHSA-2v73-9rwq-75qc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-1959","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2009-1959","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2010-1154","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2010-1155","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7044","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7045","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7553","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2009-1959","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2009-06-06T18:00:00Z","modified":"2024-08-07T05:36:19.528Z","updated_at":"2026-11-02T14:33:25.516454Z"}],"euvd":[{"id":"EUVD-2009-1954","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2009-06-06T18:00:00Z","modified":"2024-08-07T05:36:19Z","updated_at":"2026-11-03T01:39:19.419771Z"}],"ghsa":[{"id":"GHSA-2v73-9rwq-75qc","title":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13...","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2022-05-02T03:30:19Z","modified":"2025-04-09T04:11:36Z","updated_at":"2026-11-02T15:01:00.53445Z"}],"nvd":[{"id":"CVE-2009-1959","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2009-06-08T01:00:00.767Z","modified":"2026-06-16T23:08:27.04Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-189"],"updated_at":"2026-11-02T14:01:35.733785Z"}],"osv":[{"id":"CVE-2009-1959","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2009-06-08T01:00:00Z","modified":"2026-04-10T03:40:48.488107Z","updated_at":"2026-11-02T15:43:57.714116Z"},{"id":"DEBIAN-CVE-2009-1959","description":"Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.","status":"published","published":"2009-06-08T01:00:00.767Z","modified":"2026-10-23T17:47:51.010504665Z","updated_at":"2026-11-02T15:45:24.013654Z"},{"id":"openSUSE-SU-2024:10455-1","title":"irssi-0.8.20-3.1 on GA media","description":"These are all security issues fixed in the irssi-0.8.20-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:38:50.308463Z","updated_at":"2026-11-02T16:58:34.487567Z"}]}}