{"id":"CVE-2021-25219","details":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","modified":"2026-09-13T11:45:08.871940193Z","published":"2021-10-27T21:15:07.613Z","related":["ALSA-2022:2092","SUSE-SU-2021:3657-1","SUSE-SU-2021:3773-1","SUSE-SU-2022:0151-1","SUSE-SU-2022:2713-1","openSUSE-SU-2021:1502-1","openSUSE-SU-2021:3773-1","openSUSE-SU-2022:0151-1","openSUSE-SU-2024:11660-1"],"database_specific":{"unresolved_ranges":[{"source":"CPE_RANGE","vendor_product":"siemens:sinec_infrastructure_network_services","cpes":["cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*"],"extracted_events":[{"fixed":"1.0.1.1"}]},{"source":"CPE_STRING","vendor_product":"debian:debian_linux","cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"},{"introduced":"11.0"},{"last_affected":"11.0"}]},{"cpes":["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"33"},{"last_affected":"33"},{"introduced":"34"},{"last_affected":"34"},{"introduced":"35"},{"last_affected":"35"}],"source":"CPE_STRING","vendor_product":"fedoraproject:fedora"},{"extracted_events":[{"introduced":"9.9.13-s1"},{"last_affected":"9.9.13-s1"},{"introduced":"9.9.13-s1"},{"last_affected":"9.9.13-s1"},{"introduced":"9.11.5-s3"},{"last_affected":"9.11.5-s3"},{"introduced":"9.11.5-s3"},{"last_affected":"9.11.5-s3"},{"introduced":"9.11.5-s5"},{"last_affected":"9.11.5-s5"},{"introduced":"9.11.5-s5"},{"last_affected":"9.11.5-s5"},{"introduced":"9.11.5-s6"},{"last_affected":"9.11.5-s6"},{"introduced":"9.11.5-s6"},{"last_affected":"9.11.5-s6"},{"introduced":"9.11.7-s1"},{"last_affected":"9.11.7-s1"},{"introduced":"9.11.7-s1"},{"last_affected":"9.11.7-s1"},{"introduced":"9.11.8-s1"},{"last_affected":"9.11.8-s1"},{"introduced":"9.11.8-s1"},{"last_affected":"9.11.8-s1"},{"introduced":"9.11.12-s1"},{"last_affected":"9.11.12-s1"},{"introduced":"9.11.12-s1"},{"last_affected":"9.11.12-s1"},{"introduced":"9.11.21-s1"},{"last_affected":"9.11.21-s1"},{"introduced":"9.11.21-s1"},{"last_affected":"9.11.21-s1"},{"introduced":"9.11.27-s1"},{"last_affected":"9.11.27-s1"},{"introduced":"9.11.27-s1"},{"last_affected":"9.11.27-s1"},{"introduced":"9.11.29-s1"},{"last_affected":"9.11.29-s1"},{"introduced":"9.11.29-s1"},{"last_affected":"9.11.29-s1"},{"introduced":"9.11.35-s1"},{"last_affected":"9.11.35-s1"},{"introduced":"9.11.35-s1"},{"last_affected":"9.11.35-s1"},{"introduced":"9.16.8-s1"},{"last_affected":"9.16.8-s1"},{"introduced":"9.16.8-s1"},{"last_affected":"9.16.8-s1"},{"introduced":"9.16.11-s1"},{"last_affected":"9.16.11-s1"},{"introduced":"9.16.11-s1"},{"last_affected":"9.16.11-s1"},{"introduced":"9.16.13-s1"},{"last_affected":"9.16.13-s1"},{"introduced":"9.16.13-s1"},{"last_affected":"9.16.13-s1"},{"introduced":"9.16.21-s1"},{"last_affected":"9.16.21-s1"},{"introduced":"9.16.21-s1"},{"last_affected":"9.16.21-s1"}],"source":"CPE_STRING","vendor_product":"isc:bind","cpes":["cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.35:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.16.21:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:*"]},{"vendor_product":"oracle:http_server","cpes":["cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"12.2.1.3.0"},{"last_affected":"12.2.1.3.0"},{"introduced":"12.2.1.4.0"},{"last_affected":"12.2.1.4.0"}],"source":"CPE_STRING"},{"vendor_product":"oracle:zfs_storage_appliance_kit","cpes":["cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.8"},{"last_affected":"8.8"}],"source":"CPE_STRING"}]},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/"},{"type":"ADVISORY","url":"https://kb.isc.org/v1/docs/cve-2021-25219"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202210-25"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211118-0002/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4994"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"FIX","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/isc-projects/bind9","events":[{"introduced":"e8a547a3ebd21845a311580c772606e14c2eccfe"},{"fixed":"68dbd5b966f4ecea28ed4915580edd330bc481a3"},{"introduced":"71a40862c0be867999867cd99e21c2266a5e452b"},{"fixed":"59bfaba3250b291462940df5950e0098a6abb324"},{"introduced":"04ca7cc4b6993f47ea61852c759d047c83be7b3f"},{"fixed":"b63de6b58673553e68bcc576031d981b740bdbd2"},{"introduced":"1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"},{"last_affected":"eba38b89007f65bc6c1fdd2451034bbe3908b9a4"}],"database_specific":{"extracted_events":[{"introduced":"9.3.0"},{"fixed":"9.11.36"},{"introduced":"9.12.0"},{"fixed":"9.16.22"},{"introduced":"9.17.0"},{"fixed":"9.17.19"},{"introduced":"9.9.3-s1"},{"last_affected":"9.9.3-s1"},{"introduced":"9.9.12-s1"},{"last_affected":"9.9.12-s1"},{"introduced":"9.10.5-s1"},{"last_affected":"9.10.5-s1"},{"introduced":"9.10.7-s1"},{"last_affected":"9.10.7-s1"},{"introduced":"9.11.3-s1"},{"last_affected":"9.11.3-s1"},{"introduced":"9.11.6-s1"},{"last_affected":"9.11.6-s1"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*"]}}],"versions":["9.10.5-s1","9.10.7-s1","9.11.3-s1","9.11.6-s1","9.9.12-s1","9.9.3-s1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25219.json"}},{"ranges":[{"type":"GIT","repo":"https://gitlab.isc.org/isc-projects/bind9","events":[{"introduced":"e8a547a3ebd21845a311580c772606e14c2eccfe"},{"fixed":"68dbd5b966f4ecea28ed4915580edd330bc481a3"},{"introduced":"71a40862c0be867999867cd99e21c2266a5e452b"},{"fixed":"59bfaba3250b291462940df5950e0098a6abb324"},{"introduced":"04ca7cc4b6993f47ea61852c759d047c83be7b3f"},{"fixed":"b63de6b58673553e68bcc576031d981b740bdbd2"},{"introduced":"1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"},{"last_affected":"eba38b89007f65bc6c1fdd2451034bbe3908b9a4"}],"database_specific":{"cpe":["cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*","cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*"],"extracted_events":[{"introduced":"9.3.0"},{"fixed":"9.11.36"},{"introduced":"9.12.0"},{"fixed":"9.16.22"},{"introduced":"9.17.0"},{"fixed":"9.17.19"},{"introduced":"9.9.3-s1"},{"last_affected":"9.9.3-s1"},{"introduced":"9.9.12-s1"},{"last_affected":"9.9.12-s1"},{"introduced":"9.10.5-s1"},{"last_affected":"9.10.5-s1"},{"introduced":"9.10.7-s1"},{"last_affected":"9.10.7-s1"},{"introduced":"9.11.3-s1"},{"last_affected":"9.11.3-s1"},{"introduced":"9.11.6-s1"},{"last_affected":"9.11.6-s1"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["9.10.5-s1","9.10.7-s1","9.11.3-s1","9.11.6-s1","9.9.12-s1","9.9.3-s1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25219.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}