CVE-2017-20233

Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

MEDIUM
5.4
CVSS Score
Published: April 3, 2026 at 10:47 PM UTC
Updated: July 21, 2026 at 07:29 AM UTC
1 product affected across 1 vendorHirschmann HiLCOS

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 9.10.5126-RELv ≤ 9.12.5500-RELv ≤ 9.14.5500-REL

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMVulnCheck
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-284

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