CVE-2022-28328

Service interruption via malformed Multicast LLC frames

Published Apr 12, 2022 · Updated Aug 3, 2024

Improper input validation in Siemens SCALANCE W1788 before 3.0.0 allows adjacent attackers to interrupt service with malformed Multicast LLC frames. Siemens has not disclosed the packet-processing locus; affected firmware fails to reject malformed Multicast LLC frames before handling them. Exploitation requires no authentication but does require adjacent-network access, and Siemens does not specify whether the resulting denial of service is a crash, hang, or other interruption.

CVSS severity7.5
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Siemens SCALANCE W1788 before 3.0.0 allows adjacent attackers to interrupt service with malformed Multicast LLC frames. Siemens has not disclosed the packet-processing locus; affected firmware fails to reject malformed Multicast LLC frames before handling them. Exploitation requires no authentication but does require adjacent-network access, and Siemens does not specify whether the resulting denial of service is a crash, hang, or other interruption.

The record

CVE
CVE-2022-28328
Published
Apr 12, 2022
Updated
Aug 3, 2024
Vendor
Siemens
Product
SCALANCE W1788-2IA M12
Classifications
CWE-20, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V3.0.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE W1788-2IA M12version=All versions < V3.0.0
Siemens · SCALANCE W1788-2 M12version=All versions < V3.0.0
Siemens · SCALANCE W1788-2 EEC M12version=All versions < V3.0.0
Siemens · SCALANCE W1788-1 M12version=All versions < V3.0.0

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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