{"api_version":"1","generated_at":"2026-04-22T19:50:33+00:00","cve":"CVE-2022-2929","urls":{"html":"https://cve.report/CVE-2022-2929","api":"https://cve.report/api/cve/CVE-2022-2929.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-2929","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-2929"},"summary":{"title":"CVE-2022-2929","description":"In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory.","state":"PUBLIC","assigner":"security-officer@isc.org","published_at":"2022-10-07 05:15:00","updated_at":"2023-11-07 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DHCP","version":{"version_data":[{"version_name":"1.0","version_value":"1.0 through versions before 4.1-ESV-R16-P2"},{"version_name":"4.2","version_value":"4.2 through versions before 4.4.3.-P1"}]}}]},"vendor_name":"ISC"}]}},"credit":[{"lang":"eng","value":"ISC would like to thank VictorV of Cyber Kunlun Lab for discovering and reporting this issue."}],"description":{"description_data":[{"lang":"eng","value":"In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory."}]},"exploit":[{"lang":"eng","value":"We are not aware of any active exploits."}],"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"ADJACENT NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"The function fqdn_universe_decode() allocates buffer space for the contents of option 81 (fqdn) data received in a DHCP packet. The maximum length of a DNS label is 63 bytes. The function tests the length byte of each label contained in the fqdn; if it finds a label whose length byte value is larger than 63, it returns without dereferencing the buffer space. This will cause a memory leak. Affects In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1"}]}]},"references":{"reference_data":[{"name":"https://kb.isc.org/docs/cve-2022-2929","refsource":"CONFIRM","url":"https://kb.isc.org/docs/cve-2022-2929"},{"refsource":"MLIST","name":"[debian-lts-announce] 20221010 [SECURITY] [DLA 3146-1] isc-dhcp security update","url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html"},{"refsource":"FEDORA","name":"FEDORA-2022-f5a45757df","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/"},{"refsource":"FEDORA","name":"FEDORA-2022-9ca9a94e28","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/"},{"refsource":"FEDORA","name":"FEDORA-2022-c4f274a54f","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/"},{"refsource":"GENTOO","name":"GLSA-202305-22","url":"https://security.gentoo.org/glsa/202305-22"}]},"solution":[{"lang":"eng","value":"Upgrade to the patched release most closely related to your current version of ISC DHCP. These can all be downloaded from https://www.isc.org/downloads.  4.4.3-P1 4.1-ESV-R16-P2"}],"source":{"discovery":"EXTERNAL"},"work_around":[{"lang":"eng","value":"As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround."}]},"nvd":{"publishedDate":"2022-10-07 05:15:00","lastModifiedDate":"2023-11-07 03:47:00","problem_types":["CWE-770"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r12_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc2:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r10_rc1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r12_p1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r13:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r13_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r14:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r14_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r15:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r10b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r10rc1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11rc1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r11rc2:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r12-p1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r12b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r13b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r14b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r16:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r15-p1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r15_b1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:4.1-esv:r16-p1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2.0","versionEndIncluding":"4.4.3","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*","versionStartIncluding":"1.0.0","versionEndExcluding":"4.1-esv","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}