Johnson Controls EasyIO FG
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 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 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/ics 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 these vulnerabilities has been reported to CISA at this time. These vulnerabilities have a high attack complexity. These vulnerabilities are not exploitable remotely.
Revision History
Initial Release Date: 2026-10-06
Date
Revision
Summary
2026-10-06
1
Initial Republication of Johnson Controls Product Security Advisory JCI-PSA-2026-12.
Legal Notice and Terms of Use
https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-01
2026-10-06 12:00 UTC
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