{"id":"CVE-2023-50387","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-50387","generatedAt":"2026-11-04T22:24:01.395Z","title":"Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \"KeyTrap\" issue.","description":"Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \"KeyTrap\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.","published":"2024-02-14T16:15:45.000Z","lastModified":"2026-06-17T06:39:36.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":["redhat/enterprise linux","microsoft/windows server 2008","microsoft/windows server 2012","microsoft/windows server 2016","microsoft/windows server 2019","microsoft/windows server 2022","microsoft/windows server 2022 23h2","fedoraproject/fedora","thekelleys/dnsmasq","nic/knot resolver","powerdns/recursor","isc/bind","nlnetlabs/unbound"],"epss":{"score":0.9999,"percentile":0.99984,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 100.0%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2024/02/16/2","tags":["Mailing List"],"source":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2024/02/16/3","tags":["Mailing List"],"source":"cve@mitre.org"},{"url":"https://access.redhat.com/security/cve/CVE-2023-50387","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1219823","tags":["Issue Tracking"],"source":"cve@mitre.org"},{"url":"https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://kb.isc.org/docs/cve-2023-50387","tags":["Third Party Advisory","VDB 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Advisory"],"source":"cve@mitre.org"},{"url":"https://news.ycombinator.com/item?id=39372384","tags":["Issue Tracking"],"source":"cve@mitre.org"},{"url":"https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20240307-0007/","source":"cve@mitre.org"},{"url":"https://www.athene-center.de/aktuelles/key-trap","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf","tags":["Technical Description","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.isc.org/blogs/2024-bind-security-release/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/","tags":["Press/Media Coverage","Third Party 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List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://news.ycombinator.com/item?id=39367411","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://news.ycombinator.com/item?id=39372384","tags":["Issue Tracking"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-50387","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}