CVE-2021-4477
Belden Hirschmann HiLCOS OpenBAT 취약점
Hirschmann HiLCOS OpenBAT and BAT450 products contain a firewall bypass vulnerability in IPv6 IPsec deployments that allows traffic from VPN connections to bypass configured firewall rules. Attackers can exploit this vulnerability by establishing IPv6 IPsec connections (IKEv1 or IKEv2) while simultaneously using an IPv6 Internet connection to circumvent firewall policy enforcement.
- 대응 우선순위
- 점검
- CVSS
- 9.3
- EPSS
- 0.32% 백분위 24.4% · 2026.08.02 기준
- CISA KEV
- 미등록
- 조치 기한
- -
- 공개일
- 2026.04.04