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I. Basic Information for CVE-2021-4477
Vulnerability Information

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Vulnerability Title
Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Belden Hirschmann HiLCOS OpenBAT 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Belden Hirschmann HiLCOS OpenBAT是美国Belden公司的一款工业级无线局域网设备。 Belden Hirschmann HiLCOS OpenBAT存在访问控制错误漏洞,该漏洞源于IPv6 IPsec部署中的防火墙绕过问题,可能导致VPN连接流量绕过配置的防火墙规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
BeldenHirschmann HiLCOS OpenBAT 3.80-REL -
II. Public POCs for CVE-2021-4477
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III. Intelligence Information for CVE-2021-4477
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IV. Related Vulnerabilities
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