CVE-2023-28829

OPC data compromise via obsolete DCOM services

Published Jun 13, 2023 · Updated Jan 3, 2025

Use of obsolete OPC services in affected Siemens industrial software allows adjacent authenticated users to compromise OPC data. Legacy OPC DA, HDA, and AE services rely on Windows ActiveX and DCOM without modern authentication or content encryption. Exploitation requires adjacent-network access, high privileges, and enabled legacy services; confidentiality, integrity, and availability effects are limited.

CVSS severity3.9
Low
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of obsolete OPC services in affected Siemens industrial software allows adjacent authenticated users to compromise OPC data. Legacy OPC DA, HDA, and AE services rely on Windows ActiveX and DCOM without modern authentication or content encryption. Exploitation requires adjacent-network access, high privileges, and enabled legacy services; confidentiality, integrity, and availability effects are limited.

The record

CVE
CVE-2023-28829
Published
Jun 13, 2023
Updated
Jan 3, 2025
Vendor
Siemens
Product
SIMATIC WinCC
Classifications
CWE-477, T1557
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Jun 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 2025Record 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 < V8.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Siemens · SIMATIC WinCCversion=All versions < V8.0
Siemens · SIMATIC PCS 7version=All versions
Siemens · SINAUT Software ST7scversion=All versions
Siemens · SIMATIC NET PC Softwareversion=All versions

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.9Siemens AGCVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-477Use of Obsolete Function
T1557Adversary-in-the-Middle

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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