CVE-2021-4477

CRITICAL

9.1

Beschreibung

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.

CVE Details

CVSS v3.1 Bewertung9.1

SchweregradCRITICAL

CVSS VektorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

AngriffsvektorNETWORK

KomplexitatLOW

Erforderliche PrivilegienNONE

BenutzerinteraktionNONE

Veroffentlicht4/3/2026

Zuletzt geandert4/3/2026

Quellenvd

Honeypot-Sichtungen0

Schwachen (CWE)

CWE-284

Referenzen

https://assets.belden.com/m/5fd1a50fa50cb252/original/Belden-Security-Bulletin-BSECV-1v0-2019-09.pdf(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/hirschmann-hilcos-openbat-bat450-ipv6-ipsec-firewall-bypass(disclosure@vulncheck.com)

IOC Korrelationen

Keine Korrelationen erfasst

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