Johnson Controls iSTAR Ultra

Summary

Vulnerabilities 1

• High 8.7
  CVE-2025-43873

  iSTAR Ultra, Ultra SE, Ultra G2, Ultra G2 SE, iSTAR Edge G2 - Authenticated web application command injection - setFaultDebounce

  Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

  Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 Browsers
  Dec 17, 2025

Revision history

1. 2025-12-11 #1

   Initial Publication

References

• ICSA Advisory ICSA-25-345-02 - Web Version
  https://www.cisa.gov/news-events/ics-advisories/icsa-25-345-02
• Recommended Practices
  https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
• Recommended Practices
  https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
• Recommended Practices
  https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
• Recommended Practices
  https://www.cisa.gov/topics/industrial-control-systems
• Recommended Practices
  https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01
• Recommended Practices
  https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
• Recommended Practices
  https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b
• Recommended Practices
  https://www.cisa.gov/secure-our-world/teach-employees-avoid-phishing
• Recommended Practices
  https://www.cisa.gov/news-events/news/avoiding-social-engineering-and-phishing-attacks