{"schemaVersion":3,"id":"CVE-2012-3955","aliases":["RHSA-2013:0504","DEBIAN-CVE-2012-3955","DSA-2551-1"],"status":"published","duplicateOf":null,"title":null,"description":"ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an environment where the lease expiration time is later reduced.","dates":{"published":"2012-09-14T10:00:00.000Z","modified":"2024-08-06T20:21:04.060Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.1,"severity":"high","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.21653,"percentile":0.97613,"severity":"high","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.21653},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.21653,"percentile":0.97613}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.21653,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.21653,"percentile":0.97613}]},"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":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"canonical","product":"ubuntu_linux","name":"ubuntu linux","label":"ubuntu_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"10.04","noFixRecorded":false,"fixedIn":null},{"text":"11.04","noFixRecorded":false,"fixedIn":null},{"text":"11.10","noFixRecorded":false,"fixedIn":null},{"text":"12.04","noFixRecorded":false,"fixedIn":null}],"versionsText":"10.04 | 11.04 | 11.10 | 12.04","eol":{"isEol":true,"eolDate":"2013-05-09T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"10.04","label":"10.04 'Lucid Lynx' (LTS)","eolFrom":"2013-05-09T00:00:00.000Z","isLts":true,"isMaintained":false,"latestVersion":"10.04.4"},"product":{"name":"ubuntu","label":"Ubuntu","category":"os"}},"hubHref":"/vendor/canonical/ubuntu_linux"},{"vendor":"debian","product":"isc-dhcp","name":"isc-dhcp","label":"isc-dhcp","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/isc-dhcp","purlType":"deb","versions":[{"text":"< 4.2.4-2","noFixRecorded":false,"fixedIn":null},{"text":"< 4.1.1-P1-15+squeeze8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.2.4-2 | < 4.1.1-P1-15+squeeze8","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"isc-dhcp","label":"ISC DHCP","category":"server-app"}},"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"6.0","noFixRecorded":false,"fixedIn":null},{"text":"7.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"6.0 | 7.0","eol":{"isEol":true,"eolDate":"2016-02-29T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"6","label":"6 (Squeeze)","eolFrom":"2016-02-29T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"6.0.10"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"isc","product":"dhcp","name":"dhcp","label":"dhcp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.1-esv","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r1","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r2","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r3","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r3_b1","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r4","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r5","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r5_b1","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r5_rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r5_rc2","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:r6","noFixRecorded":false,"fixedIn":null},{"text":"4.1-esv:rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.0","noFixRecorded":false,"fixedIn":null},{"text":"4.1.0:a1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.0:a2","noFixRecorded":false,"fixedIn":null},{"text":"4.1.0:b1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.1:b1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.1:b2","noFixRecorded":false,"fixedIn":null},{"text":"4.1.1:b3","noFixRecorded":false,"fixedIn":null},{"text":"4.1.1:rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.2","noFixRecorded":false,"fixedIn":null},{"text":"4.1.2:b1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.2:p1","noFixRecorded":false,"fixedIn":null},{"text":"4.1.2:rc1","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.1-esv | 4.1-esv:r1 | 4.1-esv:r2 | 4.1-esv:r3 | 4.1-esv:r3_b1 | 4.1-esv:r4 | 4.1-esv:r5 | 4.1-esv:r5_b1 | 4.1-esv:r5_rc1 | 4.1-esv:r5_rc2 | 4.1-esv:r6 | 4.1-esv:rc1 | 4.1.0 | 4.1.0:a1 | 4.1.0:a2 | 4.1.0:b1 | 4.1.1 | 4.1.1:b1 | 4.1.1:b2 | 4.1.1:b3 | 4.1.1:rc1 | 4.1.2 | 4.1.2:b1 | 4.1.2:p1 | 4.1.2:rc1","eol":null,"hubHref":"/vendor/isc/dhcp"},{"vendor":"redhat","product":"dhclient","name":"dhclient","label":"dhclient","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/dhclient","purlType":"rpm","versions":[{"text":"< 12:4.1.1-34.P1.el6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12:4.1.1-34.P1.el6","eol":null,"hubHref":null},{"vendor":"redhat","product":"dhcp","name":"dhcp","label":"dhcp","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/dhcp","purlType":"rpm","versions":[{"text":"< 12:4.1.1-34.P1.el6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12:4.1.1-34.P1.el6","eol":null,"hubHref":null},{"vendor":"redhat","product":"dhcp-common","name":"dhcp-common","label":"dhcp-common","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/dhcp-common","purlType":"rpm","versions":[{"text":"< 12:4.1.1-34.P1.el6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12:4.1.1-34.P1.el6","eol":null,"hubHref":null},{"vendor":"redhat","product":"dhcp-debuginfo","name":"dhcp-debuginfo","label":"dhcp-debuginfo","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/dhcp-debuginfo","purlType":"rpm","versions":[{"text":"< 12:4.1.1-34.P1.el6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12:4.1.1-34.P1.el6","eol":null,"hubHref":null},{"vendor":"redhat","product":"dhcp-devel","name":"dhcp-devel","label":"dhcp-devel","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/dhcp-devel","purlType":"rpm","versions":[{"text":"< 12:4.1.1-34.P1.el6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12:4.1.1-34.P1.el6","eol":null,"hubHref":null}],"affectedCount":9,"eol":{"hasEol":true,"count":2},"references":[{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088220.html","label":"lists.fedoraproject.org/pipermail/package-announce/2012-September/088220.html","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-updates/2012-09/msg00103.html","label":"lists.opensuse.org/opensuse-updates/2012-09/msg00103.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://www.ubuntu.com/usn/USN-1571-1","label":"www.ubuntu.com/usn/USN-1571-1","hostname":"www.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-updates/2012-09/msg00088.html","label":"lists.opensuse.org/opensuse-updates/2012-09/msg00088.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://www.debian.org/security/2012/dsa-2551","label":"www.debian.org/security/2012/dsa-2551","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"http://secunia.com/advisories/51318","label":"secunia.com/advisories/51318","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2012:153","label":"www.mandriva.com/security/advisories?name=MDVSA-2012:153","hostname":"www.mandriva.com","tags":["Vendor Advisory","X Refsource MANDRIVA","Third Party Advisory"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-September/086992.html","label":"lists.fedoraproject.org/pipermail/package-announce/2012-September/086992.html","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/55530","label":"www.securityfocus.com/bid/55530","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Third Party Advisory"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-October/088882.html","label":"lists.fedoraproject.org/pipermail/package-announce/2012-October/088882.html","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Third Party Advisory"]},{"url":"http://rhn.redhat.com/errata/RHSA-2013-0504.html","label":"rhn.redhat.com/errata/RHSA-2013-0504.html","hostname":"rhn.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","Third Party Advisory"]},{"url":"https://blogs.oracle.com/sunsecurity/entry/cve_2012_3955_denial_of","label":"blogs.oracle.com/sunsecurity/entry/cve_2012_3955_denial_of","hostname":"blogs.oracle.com","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-updates/2012-09/msg00105.html","label":"lists.opensuse.org/opensuse-updates/2012-09/msg00105.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://security.gentoo.org/glsa/glsa-201301-06.xml","label":"security.gentoo.org/glsa/glsa-201301-06.xml","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://kb.isc.org/article/AA-00779","label":"kb.isc.org/article/AA-00779","hostname":"kb.isc.org","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"http://www.securitytracker.com/id?1027528","label":"www.securitytracker.com/id?1027528","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK","Third Party Advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2013:0504","label":"access.redhat.com/errata/RHSA-2013:0504","hostname":"access.redhat.com","tags":["Advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#low","label":"access.redhat.com/security/updates/classification/","hostname":"access.redhat.com","tags":["ARTICLE"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=803540","label":"bugzilla.redhat.com/show_bug.cgi?id=803540","hostname":"bugzilla.redhat.com","tags":["REPORT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=824622","label":"bugzilla.redhat.com/show_bug.cgi?id=824622","hostname":"bugzilla.redhat.com","tags":["REPORT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=856766","label":"bugzilla.redhat.com/show_bug.cgi?id=856766","hostname":"bugzilla.redhat.com","tags":["REPORT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2013/rhsa-2013_0504.json","label":"security.access.redhat.com/data/csaf/v2/advisories/2013/rhsa-2013_0504.json","hostname":"security.access.redhat.com","tags":["Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2012-3955","label":"access.redhat.com/security/cve/CVE-2012-3955","hostname":"access.redhat.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2012-3955","label":"www.cve.org/CVERecord?id=CVE-2012-3955","hostname":"www.cve.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2012-3955","label":"nvd.nist.gov/vuln/detail/CVE-2012-3955","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2012-3955","label":"security-tracker.debian.org/tracker/CVE-2012-3955","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2024:10358-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:10358-1"]},"timeline":[{"kind":"published","date":"2012-09-14T10:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T20:21:04.060Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":33,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T16:31:41.132Z","stale":false,"partial":false}}