Vulnerability in Belden Hirschmann Hilcos Bat867
CVE-2017-20233
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Belden Hirschmann Hilcos Bat867 — versions 0
- Belden Hirschmann Hilcos Openbat, Bat450, Wlc — versions 0
Weakness classification (CWE)
References
- assets.belden.com/m/11a07596f0bf1018/original/Security-Bulletin-IPv4-Multicast-… (vendor-advisory)
- www.vulncheck.com/advisories/hirschmann-hilcos-layer-2-firewall-multicast-broad… (third-party-advisory)
Frequently asked questions
- What is CVE-2017-20233?
- CVE-2017-20233 is a medium-severity vulnerability in Belden Hirschmann Hilcos Bat867, classified under Improper Access Control. CVSS score: 5.4/10. Published 2026-04-03.
- How severe is CVE-2017-20233?
- Medium severity. CVSS v3 base score is 5.4 out of 10.