CVE-2017-20233 PUBLISHED

Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

Assigner: VulnCheck
Reserved: 03.04.2026 Published: 03.04.2026 Updated: 03.04.2026

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: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Adjacent Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Belden
Product	Hirschmann HiLCOS OpenBAT, BAT450, WLC
Versions	Default: unaffected affected from 0 to 9.10.5126-REL (incl.) affected from 0 to 9.12.5500-REL (incl.) Version 0 is unaffected

Vendor	Belden
Product	Hirschmann HiLCOS BAT867
Versions	Default: unaffected affected from 0 to 9.14.5500-REL (incl.) Version 0 is affected

References

Problem Types

CWE-284 Improper access control CWE