{"id":"CVE-2016-6171","aliases":["DEBIAN-CVE-2016-6171","EUVD-2016-7105","GHSA-935v-fg4c-f9fr","UBUNTU-CVE-2016-6171"],"status":"published","title":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion...","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02799,"percentile":0.8655,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2017-02-09T15:00:00Z","modified":"2026-09-22T07:01:39Z","fixes":[{"ecosystem":"Debian:12","package":"knot","fixed_in":["2.3.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"knot","fixed_in":["2.3.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"knot","fixed_in":["2.3.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"knot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"knot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"knot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"knot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0-1","2.0.1-4","2.0.1-4build1","2.0.2-1","2.0.2-1build1","2.1.0~rc1-52-gd80ce77-1","2.1.0~rc1-55-gf227348-1","2.1.0-2","2.1.0-3","2.1.1-1","2.1.1-1build1"]}],"products":[{"vendor":"knot-dns","product":"knot_dns"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2016/07/06/3","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.securityfocus.com/bid/91678","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Technical Description","article"]},{"url":"http://www.openwall.com/lists/oss-security/2016/07/06/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","VDB Entry","advisory"]},{"url":"https://gitlab.labs.nic.cz/labs/knot/issues/464","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/sischkg/xfer-limit/blob/master/README.md","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-6171"},{"url":"https://github.com/advisories/GHSA-935v-fg4c-f9fr"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-6171","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-6171","tags":["report"]},{"url":"https://gitlab.labs.nic.cz/labs/knot/merge_requests/541","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-6171","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-6171","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:00:00Z","modified":"2024-08-06T01:22:20.757Z","updated_at":"2026-11-02T14:33:34.815789Z"}],"euvd":[{"id":"EUVD-2016-7105","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:00:00Z","modified":"2024-08-06T01:22:20Z","updated_at":"2026-11-03T02:22:40.469928Z"}],"ghsa":[{"id":"GHSA-935v-fg4c-f9fr","title":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion...","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2022-05-13T01:25:48Z","modified":"2023-02-01T05:07:18Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:50:31.141675Z"}],"nvd":[{"id":"CVE-2016-6171","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:59:01.19Z","modified":"2026-06-17T00:50:34.477Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:03:35.822579Z"}],"osv":[{"id":"CVE-2016-6171","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:59:01.19Z","modified":"2026-03-15T22:09:28.854792Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:02.776224Z"},{"id":"DEBIAN-CVE-2016-6171","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:59:01.19Z","modified":"2026-09-22T07:01:39.979427314Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:27.910042Z"},{"id":"UBUNTU-CVE-2016-6171","description":"Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.","status":"published","published":"2017-02-09T15:59:00Z","modified":"2026-04-22T10:53:54.607697Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:12.642042Z"}]}}