{"id":"CVE-2016-2774","details":"ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.","modified":"2026-10-24T10:30:42.421519766Z","published":"2016-03-09T15:59:00.147Z","related":["SUSE-SU-2016:1692-1","SUSE-SU-2016:1735-1","SUSE-SU-2016:1791-1","SUSE-SU-2016:2024-1"],"database_specific":{"unresolved_ranges":[{"vendor_product":"canonical:ubuntu_linux","cpes":["cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"],"extracted_events":[{"range":[{"introduced":"14.04"},{"last_affected":"14.04"},{"introduced":"16.04"},{"last_affected":"16.04"},{"introduced":"17.10"},{"last_affected":"17.10"}],"source":"CPE_STRING"}]},{"vendor_product":"debian:debian_linux","cpes":["cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"],"extracted_events":[{"range":[{"introduced":"8.0"},{"last_affected":"8.0"}],"source":"CPE_STRING"}]},{"cpes":["cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*"],"extracted_events":[{"range":[{"introduced":"4.1-esv-rc1"},{"last_affected":"4.1-esv-rc1"}],"source":"CPE_STRING"}],"vendor_product":"isc:dhcp"}]},"references":[{"type":"ADVISORY","url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.html"},{"type":"ADVISORY","url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183640.html"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-updates/2016-07/msg00066.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-2590.html"},{"type":"ADVISORY","url":"http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/84208"},{"type":"ADVISORY","url":"http://www.securitytracker.com/id/1035196"},{"type":"ADVISORY","url":"https://kb.isc.org/article/AA-01354"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2019/11/msg00023.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3586-1/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.isc.org/isc-projects/dhcp","events":[{"introduced":"b39dd193dc3d189d3669866d73a87172545e2a4b"},{"last_affected":"f02df8e557d93f388d4040a3a4610cc48391edc6"}],"database_specific":{"extracted_events":[{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-NA"},{"last_affected":"4.1-esv-NA"}],"source":"CPE_STRING"},{"range":[{"introduced":"4.1-esv-r1"},{"last_affected":"4.1-esv-r1"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1.1:-:*:*:*:*:*:*","range":[{"introduced":"4.1.1-NA"},{"last_affected":"4.1.1-NA"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r10"},{"last_affected":"4.1-esv-r10"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r10_b1"},{"last_affected":"4.1-esv-r10_b1"}]},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_b1:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r11_b1"},{"last_affected":"4.1-esv-r11_b1"}],"source":"CPE_STRING"},{"range":[{"introduced":"4.1-esv-r11_rc1"},{"last_affected":"4.1-esv-r11_rc1"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc1:*:*:*:*:*:*"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc2:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r11_rc2"},{"last_affected":"4.1-esv-r11_rc2"}]},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r12"},{"last_affected":"4.1-esv-r12"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r12_b1:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r12_b1"},{"last_affected":"4.1-esv-r12_b1"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r2"},{"last_affected":"4.1-esv-r2"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1.2:-:*:*:*:*:*:*","range":[{"introduced":"4.1.2-NA"},{"last_affected":"4.1.2-NA"}],"source":"CPE_STRING"},{"range":[{"introduced":"4.1-esv-r3"},{"last_affected":"4.1-esv-r3"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*"},{"range":[{"introduced":"4.1-esv-r3_b1"},{"last_affected":"4.1-esv-r3_b1"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:*"},{"range":[{"introduced":"4.1-esv-r4"},{"last_affected":"4.1-esv-r4"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r4:*:*:*:*:*:*"},{"range":[{"introduced":"4.1-esv-r5"},{"last_affected":"4.1-esv-r5"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r5:*:*:*:*:*:*"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r5_b1:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r5_b1"},{"last_affected":"4.1-esv-r5_b1"}]},{"range":[{"introduced":"4.1-esv-r5_rc1"},{"last_affected":"4.1-esv-r5_rc1"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc1:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc2:*:*:*:*:*:*","range":[{"introduced":"4.1-esv-r5_rc2"},{"last_affected":"4.1-esv-r5_rc2"}],"source":"CPE_STRING"},{"s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