{"cve":"CVE-2021-3672","nvd":{"published":"2021-11-23T19:15:07.877","modified":"2026-06-17T04:05:32.540","status":"Modified","description":"A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6},"cwes":["CWE-79"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1988342","https://c-ares.haxx.se/adv_20210810.html","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://security.gentoo.org/glsa/202401-02","https://www.oracle.com/security-alerts/cpujul2022.html"],"products":["c-ares_project:c-ares","fedoraproject:fedora","nodejs:node.js","pgbouncer:pgbouncer","redhat:enterprise_linux","redhat:enterprise_linux_computer_node","redhat:enterprise_linux_eus","redhat:enterprise_linux_for_ibm_z_systems","redhat:enterprise_linux_for_ibm_z_systems_eus","redhat:enterprise_linux_for_power_little_endian","redhat:enterprise_linux_for_power_little_endian_eus","redhat:enterprise_linux_server_aus","redhat:enterprise_linux_server_tus","redhat:enterprise_linux_server_update_services_for_sap_solutions","redhat:enterprise_linux_tus","redhat:enterprise_linux_workstation","siemens:sinec_infrastructure_network_services"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-3672","score":0.02814,"percentile":0.86537,"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."]}