CVE-2017-20233

Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

Published Apr 3, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
Hirschmann HiLCOS products OpenBAT, BAT450, WLC, BAT867 contains a firewall filtering vulnerability that fails to correctly filter IPv4 multicast and broadcast traffic when management IP address filtering is disabled, allowing configured filter rules to be bypassed. Attackers with network access can inject or observe multicast and broadcast packets that should have been blocked by the firewall.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Type Values Removed Values Added
First Time appeared Belden
Belden hirschmann Hilcos Bat450
Belden hirschmann Hilcos Bat867
Belden hirschmann Hilcos Openbat
Belden hirschmann Hilcos Wlc
Vendors & Products Belden
Belden hirschmann Hilcos Bat450
Belden hirschmann Hilcos Bat867
Belden hirschmann Hilcos Openbat
Belden hirschmann Hilcos Wlc
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Hirschmann HiLCOS products OpenBAT, BAT450, WLC, BAT867 contains a firewall filtering vulnerability that fails to correctly filter IPv4 multicast and broadcast traffic when management IP address filtering is disabled, allowing configured filter rules to be bypassed. Attackers with network access can inject or observe multicast and broadcast packets that should have been blocked by the firewall.
Title Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 25, 2026, 11:40 PM
Reserved
Apr 3, 2026, 5:40 PM
Status
Awaiting Analysis
Published
Apr 3, 2026, 11:16 PM
Modified
Jul 21, 2026, 7:10 AM