Hirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2017-20233
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 23:16:59 UTC
Updated2026-04-03 23:16:59 UTC
DescriptionHirschmann 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.

Risk And Classification

Primary CVSS: v4.0 5.3 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000020000 probability, percentile 0.000570000 (date 2026-04-04)

Problem Types: CWE-284 | CWE-284 CWE-284 Improper access control

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.3MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.9MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
3.1[email protected]Primary5.4MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS5.4MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Belden Hirschmann HiLCOS OpenBAT BAT450 WLC affected 9.10.5126-REL semver Not specified
CNA Belden Hirschmann HiLCOS OpenBAT BAT450 WLC affected 9.12.5500-REL semver Not specified
CNA Belden Hirschmann HiLCOS OpenBAT BAT450 WLC unaffected semver Not specified
CNA Belden Hirschmann HiLCOS BAT867 affected 9.14.5500-REL semver Not specified
CNA Belden Hirschmann HiLCOS BAT867 affected semver Not specified

References

ReferenceSourceLinkTags
www.vulncheck.com/advisories/hirschmann-hilcos-layer-2-firewall-multicast-broad... [email protected] www.vulncheck.com
assets.belden.com/m/11a07596f0bf1018/original/Security-Bulletin-IPv4-Multicast-... [email protected] assets.belden.com
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