{"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":"2026-04-16T04:30:17.615888399Z","published":"2021-10-27T21:15:07.613Z","related":["ALSA-2022:2092","CGA-jcvg-fgv3-8859","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"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/"},{"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":"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://kb.isc.org/v1/docs/cve-2021-25219"},{"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://gitlab.isc.org/isc-projects/bind9","events":[{"introduced":"e8a547a3ebd21845a311580c772606e14c2eccfe"},{"fixed":"68dbd5b966f4ecea28ed4915580edd330bc481a3"},{"introduced":"71a40862c0be867999867cd99e21c2266a5e452b"},{"fixed":"59bfaba3250b291462940df5950e0098a6abb324"},{"introduced":"04ca7cc4b6993f47ea61852c759d047c83be7b3f"},{"fixed":"b63de6b58673553e68bcc576031d981b740bdbd2"},{"introduced":"0"},{"last_affected":"1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"},{"introduced":"0"},{"last_affected":"470cee7071b278e016ae94cd403dbc13689d3444"},{"introduced":"0"},{"last_affected":"341e64a2de908ceec50ed46d243bf3402342735c"},{"introduced":"0"},{"last_affected":"fe1302d54424009769409e46c0d50c0bcccd1d31"},{"introduced":"0"},{"last_affected":"617639b7cc40ba9eb6fde2d98099726d50da812e"},{"introduced":"0"},{"last_affected":"eba38b89007f65bc6c1fdd2451034bbe3908b9a4"},{"introduced":"0"},{"last_affected":"19d6c56085e97cf4ac559cdc27edd624127bcb32"}],"database_specific":{"versions":[{"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":"0"},{"last_affected":"9.9.3-s1"},{"introduced":"0"},{"last_affected":"9.9.12-s1"},{"introduced":"0"},{"last_affected":"9.10.5-s1"},{"introduced":"0"},{"last_affected":"9.10.7-s1"},{"introduced":"0"},{"last_affected":"9.11.3-s1"},{"introduced":"0"},{"last_affected":"9.11.6-s1"},{"introduced":"0"},{"last_affected":"9.0"}]}}],"versions":["v9.0.0","v9.10.0a1","v9.10.0a2","v9.10.0b1","v9.10.0b2","v9.10.0rc1","v9.10.0rc2","v9.10.1","v9.10.1b1","v9.10.1b2","v9.10.1rc1","v9.10.1rc2","v9.10.2","v9.10.2b1","v9.10.2rc1","v9.10.2rc2","v9.10.3","v9.10.3b1","v9.10.3rc1","v9.10.4","v9.10.4b1","v9.10.4b2","v9.10.4b3","v9.10.4rc1","v9.10.5","v9.10.5b1","v9.10.5rc1","v9.10.5rc2","v9.10.5rc3","v9.10.6b1","v9.10.6rc1","v9.10.7b1","v9.11.0","v9.11.0a1","v9.11.0a2","v9.11.0a3","v9.11.0b1","v9.11.0b2","v9.11.0b3","v9.11.0rc1","v9.11.0rc2","v9.11.0rc3","v9.11.1","v9.11.11","v9.11.14","v9.11.16","v9.11.1b1","v9.11.1rc1","v9.11.1rc2","v9.11.1rc3","v9.11.2b1","v9.11.2rc1","v9.11.3b1","v9.11.3rc1","v9.11.4","v9.11.4rc2","v9.11.6","v9.11.6-P1","v9.11.6rc1","v9.11.7","v9.11.9","v9.12.0a1","v9.12.0b1","v9.12.0b2","v9.12.0rc1","v9.13.0","v9.13.2","v9.13.3","v9.13.4","v9.13.5","v9.13.6","v9.15.0","v9.15.2","v9.15.3","v9.15.4","v9.15.7","v9.15.8","v9.16.0","v9.5.0a1","v9.5.0a2","v9.5.0a3","v9.5.0a4","v9.5.0a5","v9.5.0a6","v9.7.0a1","v9.9.0","v9.9.0rc3","v9.9.0rc4","v9.9.1","v9.9.10","v9.9.10b1","v9.9.10rc1","v9.9.10rc2","v9.9.10rc3","v9.9.11b1","v9.9.11rc1","v9.9.12b1","v9.9.2b1","v9.9.2rc1","v9.9.3","v9.9.3b1","v9.9.3b2","v9.9.3rc1","v9.9.3rc2","v9.9.4","v9.9.4b1","v9.9.4rc2","v9.9.5","v9.9.5b1","v9.9.5rc1","v9.9.5rc2","v9.9.6","v9.9.6b1","v9.9.6b2","v9.9.6rc1","v9.9.6rc2","v9.9.7","v9.9.7b1","v9.9.7rc1","v9.9.7rc2","v9.9.8","v9.9.8b1","v9.9.8rc1","v9.9.9","v9.9.9b1","v9.9.9b2","v9.9.9rc1"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"9.9.13-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.5-s3"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.5-s5"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.5-s6"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.7-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.8-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.12-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.21-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.27-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.11.29-s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