{"cve":"CVE-2009-3602","nvd":{"published":"2009-10-13T10:30:00.657","modified":"2026-06-16T23:11:59.270","status":"Modified","description":"Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks in conjunction with crafted delegation responses.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-310"],"references":["http://osvdb.org/58836","http://secunia.com/advisories/36996","http://secunia.com/advisories/37913","http://unbound.net/pipermail/unbound-users/2009-October/000852.html","http://www.debian.org/security/2009/dsa-1963"],"products":["nlnetlabs:unbound"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-3602","score":0.02976,"percentile":0.87267,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}