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Summary

The products listed below contain a denial of service vulnerability that could allow an attacker to force the devices into protection mode under certain conditions. This disables remote connectivity functions (Web Access) to the devices. Siemens has released new versions for the affected products and recommends to update to the latest versions.

The following versions of Siemens WTV676 and WTV776 are affected:

  • WTV676-HB6035 Web Interface vers:intdot/<3.94 (CVE-2026-89207)
  • WTV776-HB6035 Web Interface vers:intdot/<4.17 (CVE-2026-89207)

CVSS

Vendor

Equipment

Vulnerabilities

v3 6.5

Siemens

Siemens WTV676 and WTV776

Improper Validation of Specified Type of Input

Background

  • Critical Infrastructure Sectors: Energy
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: Germany

Vulnerabilities

Expand All +

CVE-2026-89207

Affected devices do not properly validate input received from backend services. This could allow an unauthenticated remote attacker to force the device into protection mode, which results in losing remote connectivity functions (Web Access).

View CVE Details

Affected Products

Siemens WTV676 and WTV776

Vendor:

Siemens

Product Version:

WTV676-HB6035 Web Interface < V3.94, WTV776-HB6035 Web Interface < V4.17

Product Status:

known_affected

Remediations

Vendor fix

Update to V3.94 or later version

https://support.industry.siemens.com/cs/ww/en/view/109480838/

Vendor fix

Update to V4.17 or later version

https://support.industry.siemens.com/cs/ww/en/view/109480838/

Mitigation

For more information see the associated Siemens security advisory SSA-823812 in HTML and CSAF.

Relevant CWE: CWE-1287 Improper Validation of Specified Type of Input

Metrics

CVSS Version

Base Score

Base Severity

Vector String

3.1

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Acknowledgments

  • Siemens ProductCERT reported this vulnerability to CISA.

General Recommendations

As a general security measure Siemens strongly recommends protecting network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices 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.

Legal Notice and Terms of Use

This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

Recommended Practices

CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.

  • Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.
  • Locate control system networks and remote devices behind firewalls and isolate 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 recent version available. Also recognize VPN is only as secure as its 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.

Advisory Conversion Disclaimer

This ICSA is a verbatim republication of Siemens ProductCERT SSA-823812 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Siemens ProductCERT directly for any questions regarding this advisory.

Revision History

  • Initial Release Date: 2026-09-16

Date

Revision

Summary

2026-09-16

1

Publication Date

2026-09-22

2

Initial CISA Republication of Siemens ProductCERT SSA-823812 advisory

Legal Notice and Terms of Use