CVE-2017-20233 Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass
Attackers can bypass firewall filters to inject or observe multicast traffic when management IP filtering is disabled on Hirschmann HiLCOS devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-20233?
CVE-2017-20233 is a medium-severity vulnerability in Belden Hirschmann HiLCOS BAT867, published on 3 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2017-20233?
How do I fix CVE-2017-20233?
No fix has been published for CVE-2017-20233 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-20233 being exploited?
There is no known exploitation of CVE-2017-20233 in the wild and no public exploit code.
Sources
Also known as GHSA-w392-grj8-mrrf.