{"id":"CVE-2011-4869","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-4869","generatedAt":"2026-10-28T02:17:52.869Z","title":"validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a…","description":"validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.","published":"2011-12-20T11:55:09.000Z","lastModified":"2026-06-16T23:35:33.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":7.8,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C"},"cwe":["CWE-399"],"affected":["unbound/unbound"],"epss":{"score":0.02985,"percentile":0.87206,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html","source":"cve@mitre.org"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html","source":"cve@mitre.org"},{"url":"http://osvdb.org/77910","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/47326","source":"cve@mitre.org"},{"url":"http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2011/dsa-2370","source":"cve@mitre.org"},{"url":"http://www.kb.cert.org/vuls/id/209659","tags":["Patch","US Government Resource"],"source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/71868","source":"cve@mitre.org"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://osvdb.org/77910","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/47326","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2011/dsa-2370","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.kb.cert.org/vuls/id/209659","tags":["Patch","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/71868","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-4869","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."}