Firewall Filtering Bypass in Hirschmann HiLCOS via Multicast Traffic

Publication date: 2026-04-03

Last updated on: 2026-04-03

Assigner: VulnCheck

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 Scores

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Meta Information

Published

2026-04-03

Last Modified

2026-04-03

Generated

2026-07-06

AI Q&A

2026-04-04

EPSS Evaluated

2026-07-05

NVD

CVE-2017-20233

EUVD

EUVD-2017-18955

Affected Vendors & Products

Vendor	Product	Version / Range
hirschmann	hilcos_openbat	*
hirschmann	hilcos_bat450	*
hirschmann	hilcos_wlc	*
hirschmann	hilcos_bat867	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Hirschmann HiLCOS products OpenBAT, BAT450, WLC, and BAT867. It is a firewall filtering issue where the firewall fails to correctly filter IPv4 multicast and broadcast traffic when management IP address filtering is disabled. As a result, configured filter rules can be bypassed, allowing attackers with network access to inject or observe multicast and broadcast packets that should have been blocked by the firewall.

Impact Analysis

The impact of this vulnerability is that attackers with network access can bypass firewall rules to inject or observe multicast and broadcast traffic that should have been blocked. This can lead to unauthorized network traffic being sent or received, potentially exposing sensitive information or allowing malicious traffic to propagate within the network.

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