{"cve":"CVE-2021-3499","nvd":{"published":"2021-06-02T16:15:10.320","modified":"2026-06-17T04:05:12.850","status":"Modified","description":"A vulnerability was found in OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service.","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-863"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1949188","https://bugzilla.redhat.com/show_bug.cgi?id=1949188"],"products":["ovn:ovn-kubernetes"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-3499","score":0.00799,"percentile":0.56556,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-57v4-m9jx-mh8r","url":"https://osv.dev/vulnerability/GHSA-57v4-m9jx-mh8r","summary":"Improper Input Validation","modified":"2023-11-08T04:06:08.913641Z","packages":[{"ecosystem":"Go","name":"github.com/ovn-org/ovn-kubernetes","purl":"pkg:golang/github.com/ovn-org/ovn-kubernetes","ranges":["<=0.3.0"],"fixed":[]}]}],"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."]}