Siemens SICORE Firmware Signature Validation Vulnerability
A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.20), SICORE Base system (All versions < V26.20.0). The affected application contains a vulnerability in its firmware update mechanism's signature validation process. This could allow an attacker to install malicious firmware, leading to persistent code execution and system compromise.
Quick answer
Siemens SICORE Base system should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- CPCI85 Central Processing/Communication before V26.20
- SICORE Base system before V26.20.0
Fixed versions
- CPCI85 V26.20 or later
- SICORE Base system V26.20.0 or later
How to fix it
Siemens SICORE Base system and CPCI85 are affected by a firmware update signature validation weakness. Upgrade to the fixed versions and verify firmware provenance before applying updates. Because malicious firmware can create persistent compromise, review update history and device integrity carefully.
- Inventory affected Siemens SICORE and CPCI85 systems and record firmware and application versions.
- Upgrade CPCI85 to V26.20 or later and SICORE Base system to V26.20.0 or later.
- Accept firmware only from Siemens-approved distribution channels and verify signatures where available.
- Restrict firmware update capability to trusted engineering workstations and privileged operators.
- Review firmware update history, maintenance logs, and file transfer records for unauthorized updates.
- Rotate operator credentials and rebuild from trusted firmware if unauthorized firmware installation is suspected.
- Document a controlled firmware update process with backups and rollback plans.
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Verify the fix
- Confirm fixed Siemens versions are installed.
- Validate unsigned or modified firmware packages are rejected by the update process.
- Review maintenance and update logs for unexpected firmware activity.
- Test normal update validation and operational functions after remediation.
- Run a Fixnx scan and confirm no public firmware update interface is exposed.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-54799?
Siemens SICORE Base system versions listed as affected should be reviewed: CPCI85 Central Processing/Communication before V26.20, SICORE Base system before V26.20.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.