{"id":"CVE-2011-4528","aliases":["DEBIAN-CVE-2011-4528","DSA-2370-1","EUVD-2011-4454","GHSA-q376-m379-55x8"],"status":"published","title":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME...","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.02841,"percentile":0.86753,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-399"],"published":"2011-12-20T11:00:00Z","modified":"2026-10-23T17:47:37Z","fixes":[{"ecosystem":"Debian:12","package":"unbound","fixed_in":["1.4.14-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"unbound","fixed_in":["1.4.14-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"unbound","fixed_in":["1.4.14-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.14-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.14-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.14-1"}]}]},{"source":"osv","ecosystem":"Debian:5.0","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.6-1~lenny2"}]}],"versions":["1.0.2-1","1.0.2-1+lenny1","1.0.2-1.1","1.0.2-1.2","1.2.1-1","1.2.1-1~bpo40+1","1.2.1-2","1.3.0-1","1.3.2-1","1.3.3-1","1.3.4-1","1.4.0-1","1.4.1-1","1.4.1-2","1.4.2-1","1.4.3-1","1.4.4-1","1.4.5-1","1.4.5-1~bpo50+1","1.4.6-1~bpo50+1","1.4.6-1~lenny1"],"bundled":2},{"source":"osv","ecosystem":"Debian:6.0","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.6-1+squeeze2"}]}],"versions":["1.4.6-1"],"bundled":2}],"products":[{"vendor":"unbound","product":"unbound"}],"references":[{"url":"http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"http://secunia.com/advisories/47326","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.kb.cert.org/vuls/id/209659","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","Patch","Third Party Advisory","US Government Resource","advisory","fix","web"]},{"url":"http://www.debian.org/security/2011/dsa-2370","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","advisory"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"http://osvdb.org/77909","tags":["vdb-entry","x_refsource_OSVDB","x_transferred","web"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4528"},{"url":"https://github.com/advisories/GHSA-q376-m379-55x8"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-4528","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-4528","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2011-12-20T11:00:00Z","modified":"2024-08-07T00:09:18.826Z","updated_at":"2026-11-02T14:35:37.989579Z"}],"euvd":[{"id":"EUVD-2011-4454","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2011-12-20T11:00:00Z","modified":"2024-08-07T00:09:18Z","updated_at":"2026-11-03T01:39:48.961231Z"}],"ghsa":[{"id":"GHSA-q376-m379-55x8","title":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME...","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2022-05-17T05:19:14Z","modified":"2023-01-28T05:03:54Z","updated_at":"2026-11-02T14:44:04.026586Z"}],"nvd":[{"id":"CVE-2011-4528","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2011-12-20T11:55:05.757Z","modified":"2026-06-16T23:34:59.68Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-399"],"updated_at":"2026-11-02T14:02:11.800512Z"}],"osv":[{"id":"CVE-2011-4528","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2011-12-20T11:55:05Z","modified":"2026-04-10T03:42:05.140208Z","updated_at":"2026-11-02T15:43:58.279353Z"},{"id":"DEBIAN-CVE-2011-4528","description":"Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.","status":"published","published":"2011-12-20T11:55:05.757Z","modified":"2026-10-23T17:47:37.97418016Z","updated_at":"2026-11-02T15:45:24.612044Z"},{"id":"DSA-2370-1","title":"unbound - several","status":"published","published":"2011-12-22T00:00:00Z","modified":"2026-03-09T01:21:38.482947Z","updated_at":"2026-11-02T15:46:15.108335Z"}]}}