{"schemaVersion":3,"id":"CVE-2009-1959","aliases":["DEBIAN-CVE-2009-1959"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2009-06-06T18:00:00.000Z","modified":"2024-08-07T05:36:19.528Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.08385,"percentile":0.94961,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.08385},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.08385,"percentile":0.94961}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.08385,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.08385,"percentile":0.94961}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_803A4F73A90FC1E9","name":"Exploit Reference (xorl.wordpress.com)","source":"reference","url":"http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_7F46A872B6D7AC99","name":"Exploit Reference (irssi.org)","source":"reference","url":"http://www.irssi.org/ChangeLog","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_10AF0CEA8FBCF182","name":"Exploit Reference (bugs.irssi.org)","source":"reference","url":"http://bugs.irssi.org/index.php?do=details&task_id=662","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"33041","name":"Irssi 0.8.13 - 'WALLOPS' Message Off-by-One Heap Memory Corruption","source":"exploit-database","url":"https://www.exploit-db.com/exploits/33041","maturity":"poc","reliabilityScore":0.8,"verified":true,"type":"dos","platforms":["linux"],"requiresAuth":null,"exploitdb":{"verified":true,"type":"dos","platform":"linux","file":"exploits/linux/dos/33041.txt","codes":["CVE-2009-1959","OSVDB-54977"]},"metasploit":null}],"exploitCount":4,"weaknesses":[{"id":"CWE-189","name":"Numeric Errors","description":"Weaknesses in this category are related to improper calculation or conversion of numbers.","type":"category","status":"Draft","abstraction":null,"likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/189.html"}],"affected":[{"vendor":"debian","product":"irssi","name":"irssi","label":"irssi","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/irssi","purlType":"deb","versions":[{"text":"< 0.8.13-2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.8.13-2","eol":null,"hubHref":null},{"vendor":"irssi","product":"irssi","name":"irssi","label":"irssi","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"0.8.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"0.8.13","eol":null,"hubHref":"/vendor/irssi/irssi"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/","label":"xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/","hostname":"xorl.wordpress.com","tags":["X Refsource MISC","Exploit"]},{"url":"http://www.securitytracker.com/id?1022410","label":"www.securitytracker.com/id?1022410","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK"]},{"url":"http://www.openwall.com/lists/oss-security/2009/05/29/3","label":"www.openwall.com/lists/oss-security/2009/05/29/3","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"http://www.securityfocus.com/bid/35399","label":"www.securityfocus.com/bid/35399","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID"]},{"url":"http://www.irssi.org/ChangeLog","label":"www.irssi.org/ChangeLog","hostname":"www.irssi.org","tags":["X Refsource CONFIRM","Exploit","Vendor Advisory"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html","label":"www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html","hostname":"www.redhat.com","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"http://bugs.irssi.org/index.php?do=details&task_id=662","label":"bugs.irssi.org/index.php?do=details&task_id=662","hostname":"bugs.irssi.org","tags":["X Refsource CONFIRM","Exploit","Vendor Advisory"]},{"url":"http://secunia.com/advisories/35685","label":"secunia.com/advisories/35685","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://www.vupen.com/english/advisories/2009/1596","label":"www.vupen.com/english/advisories/2009/1596","hostname":"www.vupen.com","tags":["VDB Entry","X Refsource VUPEN"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html","label":"lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE"]},{"url":"http://www.ubuntu.com/usn/usn-800-1","label":"www.ubuntu.com/usn/usn-800-1","hostname":"www.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU"]},{"url":"http://secunia.com/advisories/35812","label":"secunia.com/advisories/35812","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:133","label":"www.mandriva.com/security/advisories?name=MDVSA-2009:133","hostname":"www.mandriva.com","tags":["Vendor Advisory","X Refsource MANDRIVA"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/51184","label":"exchange.xforce.ibmcloud.com/vulnerabilities/51184","hostname":"exchange.xforce.ibmcloud.com","tags":["VDB Entry","X Refsource XF"]},{"url":"http://secunia.com/advisories/36152","label":"secunia.com/advisories/36152","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-1959","label":"security-tracker.debian.org/tracker/CVE-2009-1959","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2024:10455-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:10455-1"]},"timeline":[{"kind":"published","date":"2009-06-06T18:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-07T05:36:19.528Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T06:50:47.590Z","stale":false,"partial":false}}