CVE-2017-20233 MEDIUM

CVE-2017-20233: Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

Vendor Belden
Product Hirschmann HiLCOS OpenBAT, BAT450, WLC
Weakness CWE-284
Published April 3, 2026
Last update May 25, 2026
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
May 25, 2026 Record updated