CVE-2026-54800: Siemens SICAM 8 insecure default configuration in OPC UA

CVE-2026-54800 · Severity: medium · CVSS 4.8 · Published 2026-07-09

Siemens SICAM 8 power automation devices are affected by a security flaw where the default configuration disables all security protections for the OPC UA communication protocol. This component is used to manage communications in critical power grid infrastructure. An attacker could exploit this to gain unauthorized access and control over critical system functions, potentially impacting the reliability of power grid operations.

Technologies: Siemens CPCI85 Central Processing/Communication, Siemens SICORE Base system. Vendors: Siemens.

Quick answers

Is CVE-2026-54800 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-54800 being exploited in the wild.
How severe is CVE-2026-54800?
Medium severity, with a CVSS score of 4.8, published 9 July 2026.
Which products and versions are affected?
Siemens CPCI85 Central Processing/Communication All versions < V26.20; Siemens SICORE Base system All versions < V26.20.0.
Is there a fix for CVE-2026-54800?
A patch was published on 2026-07-09: Fixes released in CPCI85 V26.20 and SICORE V26.20.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54800 attacked?
It is attacked over the network, in device firmware.
Am I affected by CVE-2026-54800?
Check whether you run Siemens CPCI85 Central Processing/Communication or Siemens SICORE Base system at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability (CWE-1188) exists in the default initialization of the OPC UA interface within Siemens CPCI85 and SICORE firmware. The application ships with a configuration that disables all OPC UA security mechanisms by default. A remote attacker can exploit this over the network to gain unauthorized access and control over critical system functions. While the attack requires high complexity (AC:H), it requires no authentication or user interaction. Siemens has released firmware updates (V26.20/V26.20.0) to address this issue and recommends following general security guidelines for protecting industrial network access.

Affected products

  • Siemens CPCI85 Central Processing/Communication All versions < V26.20
  • Siemens SICORE Base system All versions < V26.20.0

Timeline

  • 2026-07-09: disclosed: Initial publication of SSA-229470 by Siemens ProductCERT
  • 2026-07-09: patched: Fixes released in CPCI85 V26.20 and SICORE V26.20.0

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.