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CVE-2017-20233

Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

Published: Apr 3, 2026Updated: Apr 7, 2026 Sources: CVE List NVDCWE-284
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 89.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-284

Affected Products

Hirschmann HiLCOS OpenBAT, BAT450, WLCBeldenNetworking Infrastructure
Hirschmann HiLCOS BAT867BeldenNetworking Infrastructure
beldencommercialUSNetworking Infrastructureaka belden hirschmann, tofino security appliance

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://assets.belden.com/m/11a07596f0bf1018/original/Security-Bulletin-IPv4-Multicast-HiLCOS-Layer-2-Firewall-BSECV-2017-03.pdf
assets.belden.com
https://www.vulncheck.com/advisories/hirschmann-hilcos-layer-2-firewall-multicast-broadcast-traffic-bypass
vulncheck.com

Timeline

Published
Apr 3, 2026
Last Updated
Apr 7, 2026

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