Johnson Controls EasyIO FG

Summary

Two vulnerabilities, CVE-2026-27872 and CVE-2026-27873, have been identified in Johnson Controls EasyIO FG firmware versions up to 2.0b52. These flaws stem from the use of hard-coded credentials and improper privilege management, potentially allowing an attacker to gain full unauthorized access. Johnson Controls has stated that the EasyIO FG series is End-of-Life and End-of-Support, with no patches available, advising users to migrate to newer products and implement strict network segmentation and access controls.

Full text

ICS Advisory Johnson Controls EasyIO FG Release DateOctober 06, 2026 Alert CodeICSA-26-279-01 Related topics: Industrial Control System Vulnerabilities View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to gain full unauthorized access to the device. The following versions of Johnson Controls EasyIO FG are affected: EasyIO FG firmware <=2.0b52 (CVE-2026-27872, CVE-2026-27873) CVSS Vendor Equipment v3 7.7 Johnson Controls EasyIO FG firmware 2 Vulnerabilities Use of Hard-coded Credentials, Improper Privilege Management Background Critical Infrastructure Sectors: Critical Manufacturing, Commercial Facilities, Government Services and Facilities, Transportation Systems, Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Ireland Vulnerabilities Expand All + CVE-2026-27872 A vulnerability exists in EasyIO FG relating to an attacker gaining unauthorized access to the system through hard-coded credentials and improper privilege management, potentially resulting in full device compromise. Successful exploitation could result in technical or operational impact. Read More 1 Affected Product Johnson Controls EasyIO FG firmware: <=2.0b52 Product Status: known_affected Remediations MitigationJohnson Controls has determined that the EasyIO FG Series has reached End-of-Life (EOL) and End-of-Support (EOS) status. The product has not been manufactured or sold since prior to 2019, and the source code is no longer available. As a result, no firmware patch or code-level fix will be issued. Users are advised to migrate to supported current-generation products (e.g., EasyIO Neo R1 Series). MitigationDeploy devices only within isolated BAS/OT networks MitigationEnsure no direct Internet exposure MitigationEnforce strict VLAN segmentation from enterprise IT networks MitigationRestrict access to trusted engineering workstations only MitigationBlock all remote login access from untrusted networks MitigationAllow connections only from whitelisted IP addresses MitigationBlock all Internet-originated traffic MitigationPrevent unauthorized lateral movement across networks MitigationRestrict communication to required protocols only MitigationDisable insecure services (e.g., Telnet), if enabled MitigationDisable any unnecessary services or exposed ports MitigationMonitor for repeated login attempts MitigationMonitor for unauthorized or root-level access MitigationEnable logging and centralized monitoring (where supported) MitigationRestrict distribution of firmware images MitigationPrevent unauthorized physical and console access MitigationFor more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2026-12 at the following location: https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories Additional Metrics Relevant CWE: CWE-798 Use of Hard-coded Credentials CVSS Version Base Score Base Severity Vector String 3.1 7.7 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H 4.0 7.2 HIGH CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H View CVE Details CVE-2026-27873 A vulnerability exists in EasyIO FG relating to an attacker gaining unauthorized access to the system through hard-coded credentials and improper privilege management, potentially resulting in full device compromise. Successful exploitation could result in technical or operational impact. Read More 2 Affected Products Johnson Controls EasyIO FG firmware: <=2.0b52 Product Status: known_affected Remediations MitigationJohnson Controls has determined that the EasyIO FG Series has reached End-of-Life (EOL) and End-of-Support (EOS) status. The product has not been manufactured or sold since prior to 2019, and the source code is no longer available. As a result, no firmware patch or code-level fix will be issued. Users are advised to migrate to supported current-generation products (e.g., EasyIO Neo R1 Series). MitigationDeploy devices only within isolated BAS/OT networks MitigationEnsure no direct Internet exposure MitigationEnforce strict VLAN segmentation from enterprise IT networks MitigationRestrict access to trusted engineering workstations only MitigationBlock all remote login access from untrusted networks MitigationAllow connections only from whitelisted IP addresses MitigationBlock all Internet-originated traffic MitigationPrevent unauthorized lateral movement across networks MitigationRestrict communication to required protocols only MitigationDisable insecure services (e.g., Telnet), if enabled MitigationDisable any unnecessary services or exposed ports MitigationMonitor for repeated login attempts MitigationMonitor for unauthorized or root-level access MitigationEnable logging and centralized monitoring (where supported) MitigationRestrict distribution of firmware images MitigationPrevent unauthorized physical and console access MitigationFor more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2026-12 at the following location: https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories Johnson Controls EasyIO FG firmware: <=2.0b52 Product Status: known_affected Remediations MitigationJohnson Controls has determined that the EasyIO FG Series has reached End-of-Life (EOL) and End-of-Support (EOS) status. The product has not been manufactured or sold since prior to 2019, and the source code is no longer available. As a result, no firmware patch or code-level fix will be issued. Users are advised to migrate to supported current-generation products (e.g., EasyIO Neo R1 Series). MitigationDeploy devices only within isolated BAS/OT networks MitigationEnsure no direct Internet exposure MitigationEnforce strict VLAN segmentation from enterprise IT networks MitigationRestrict access to trusted engineering workstations only MitigationBlock all remote login access from untrusted networks MitigationAllow connections only from whitelisted IP addresses MitigationBlock all Internet-originated traffic MitigationPrevent unauthorized lateral movement across networks MitigationRestrict communication to required protocols only MitigationDisable insecure services (e.g., Telnet), if enabled MitigationDisable any unnecessary services or exposed ports MitigationMonitor for repeated login attempts MitigationMonitor for unauthorized or root-level access MitigationEnable logging and centralized monitoring (where supported) MitigationRestrict distribution of firmware images MitigationPrevent unauthorized physical and console access MitigationFor more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2026-12 at the following location: https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories Additional Metrics Relevant CWE: CWE-269 Improper Privilege Management CVSS Version Base Score Base Severity Vector String 3.1 7.7 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H 4.0 7.2 HIGH CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H View CVE Details Acknowledgments Gabriele Gardois, Zachary Bushell and Lorenzo De Carli of the University of Calgary (Canada) reported these vulnerabilities to Johnson Controls. 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 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

Indicators of Compromise

• cve — CVE-2026-27872
• cve — CVE-2026-27873

Entities