Summary
PSS(R)SINCAL uses WibuKey third-party product that contains an out-of-bounds write vulnerability. An attacker could exploit this vulnerability to cause a system crash, resulting in a denial-of-service condition. This affects PSS SINCAL only when configured to use the legacy WibuKey dongle license type. Siemens is actively preparing updates and recommends applicable mitigations for products where patches are currently unavailable.
The following versions of Siemens PSS(R)SINCAL are affected:
- PSS(R)SINCAL V21.5 vers:all/* (CVE-2026-84854)
- PSS(R)SINCAL V22.0 vers:all/* (CVE-2026-84854)
- PSS(R)SINCAL V22.5 vers:intdot/<22.5.5 (CVE-2026-84854)
CVSS
Vendor
Equipment
v3 7
Siemens
PSS(R)SINCAL V21.5
1 Vulnerability
Out-of-bounds Write
Background
- Critical Infrastructure Sectors: Critical Manufacturing, Transportation Systems, Energy, Healthcare and Public Health, Financial Services, Government Services and Facilities
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Germany
Vulnerabilities
CVE-2026-84854
In the WibuKey driver, insufficient validation of user input when calculating the size of a kernel buffer could cause small amounts of data to be written outside the intended kernel buffer. This can lead to a system crash. Under unfavorable circumstances, adjacent kernel memory may be modified.
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3 Affected Products
PSS(R)SINCAL V21.5
Product Status: known_affected
Remediations
Mitigation
Install WIBU Systems WibuKey Runtime for Windows 6.72 or later version manually to fix the issue: Download the package from User Software – Wibu-Systems and follow the installation instructions from WIBU Systems.
None available
Currently no fix is available
PSS(R)SINCAL V22.0
Product Status: known_affected
Remediations
Mitigation
Install WIBU Systems WibuKey Runtime for Windows 6.72 or later version manually to fix the issue: Download the package from User Software – Wibu-Systems and follow the installation instructions from WIBU Systems.
None available
Currently no fix is available
PSS(R)SINCAL V22.5 < V22.5 Update 5
Product Status: known_affected
Remediations
Vendor fix
Update to V22.5 Update 5 or later version
Additional Metrics
Relevant CWE: CWE-787 Out-of-bounds Write
CVSS Version
Base Score
Base Severity
Vector String
3.1
7
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Acknowledgments
- Siemens ProductCERT reported this vulnerability to CISA.
General Recommendations
Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can thus be minimized by virtue of the grid design. Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment. As a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment.
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.
- Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
- Locate control system networks and remote devices behind firewalls and isolating them from business networks.
- When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and
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