1. EXECUTIVE SUMMARY
- CVSS v4 7.0
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: HyperLynx and Industrial Edge App Publisher
- Vulnerability: Access of Resource Using Incompatible Type ('Type Confusion')
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a remote attacker to perform arbitrary code execution via a crafted HTML page.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports that the following products are affected:
- Siemens HyperLynx: vers:all/*
- Siemens Industrial Edge App Publisher: vers:intdot/
3.2 VULNERABILITY OVERVIEW
3.2.1 ACCESS OF RESOURCE USING INCOMPATIBLE TYPE ('TYPE CONFUSION') CWE-843
Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page. (Chromium security severity: High) For HyperLynx: An attacker would need to modify local files and need access to the application in order to exploit.
CVE-2025-6554 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.1 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N).
A CVSS v4 score has also been calculated for CVE-2025-6554. A base score of 7.0 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N).
3.3 PRODUCT IMPACT
Product-specific impact for an affected product vulnerable to the CVE:
- CVE-2025-6554
- (Siemens HyperLynx): A CVSS v3.1 base score of 6.6 has been calculated; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N).
- (Siemens HyperLynx): A CVSS v4.0 base score of 6.8 has been calculated; the CVSS vector string is (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N).
3.4 BACKGROUND
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Germany
3.5 RESEARCHER
Siemens ProductCERT reported this vulnerability to CISA.
4. MITIGATIONS
Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
- HyperLynx: Currently no fix is available
- Industrial Edge App Publisher: Update to V1.23.5 or later version
As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.
For more information see the associated Siemens security advisory SSA-365200 in HTML and CSAF.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
- 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). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are 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. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
- Do not click web links or open attachments in unsolicited email messages.
- Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
- Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
5. UPDATE HISTORY
- October 16, 2025: Initial Republication of Siemens ProductCERT SSA-365200