Johnson Controls EasyIO FG
CISA says end-of-life Johnson Controls EasyIO FG firmware has hard-coded credential flaws and will not be patched.
CISA published an advisory for Johnson Controls EasyIO FG firmware 2.0b52 and earlier. CVE-2026-27872 and CVE-2026-27873 involve hard-coded credentials and improper privilege management that could give an attacker full device access; both are scored CVSS 7.7 and require local access with high complexity. The series is end-of-life and end-of-support, unsold since before 2019, and no firmware fix will be issued. Operators are told to migrate to EasyIO Neo and keep devices off the internet on segmented building-automation networks. Exploitation is not reported.
- EasyIO FG firmware 2.0b52 and earlier is affected and has been EOL since before 2019.
- Both flaws involve hard-coded credentials and improper privilege management, CVSS 7.7.
- No patch will be issued; Johnson Controls advises migrating to EasyIO Neo and isolating devices.
Vulnerabilities mentionedAll →
- CVE-2026-278725.6—Improper privilege management in Johnson Controls Easy IO FGpublished · Johnson Controls Easy IO FG
- CVE-2026-278735.6—Hard-coded credentials in Johnson Controls EasyIO FGpublished · Johnson Controls EasyIO FG
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure |
|---|
Full article1,215 words · extracted from cisa.gov · click to collapse
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
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.
1 Affected Product
Johnson Controls EasyIO FG firmware: <=2.0b52
Product Status: known_affected
Remediations
Mitigation
Johnson 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).
Mitigation
Deploy devices only within isolated BAS/OT networks
Mitigation
Ensure no direct Internet exposure
Mitigation
Enforce strict VLAN segmentation from enterprise IT networks
Mitigation
Restrict access to trusted engineering workstations only
Mitigation
Block all remote login access from untrusted networks
Mitigation
Allow connections only from whitelisted IP addresses
Mitigation
Block all Internet-originated traffic
Mitigation
Prevent unauthorized lateral movement across networks
Mitigation
Restrict communication to required protocols only
Mitigation
Disable insecure services (e.g., Telnet), if enabled
Mitigation
Disable any unnecessary services or exposed ports
Mitigation
Monitor for repeated login attempts
Mitigation
Monitor for unauthorized or root-level access
Mitigation
Enable logging and centralized monitoring (where supported)
Mitigation
Restrict distribution of firmware images
Mitigation
Prevent unauthorized physical and console access
Mitigation
For 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 |
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.
2 Affected Products
Johnson Controls EasyIO FG firmware: <=2.0b52
Product Status: known_affected
Remediations
Mitigation
Johnson 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).
Mitigation
Deploy devices only within isolated BAS/OT networks
Mitigation
Ensure no direct Internet exposure
Mitigation
Enforce strict VLAN segmentation from enterprise IT networks
Mitigation
Restrict access to trusted engineering workstations only
Mitigation
Block all remote login access from untrusted networks
Mitigation
Allow connections only from whitelisted IP addresses
Mitigation
Block all Internet-originated traffic
Mitigation
Prevent unauthorized lateral movement across networks
Mitigation
Restrict communication to required protocols only
Mitigation
Disable insecure services (e.g., Telnet), if enabled
Mitigation
Disable any unnecessary services or exposed ports
Mitigation
Monitor for repeated login attempts
Mitigation
Monitor for unauthorized or root-level access
Mitigation
Enable logging and centralized monitoring (where supported)
Mitigation
Restrict distribution of firmware images
Mitigation
Prevent unauthorized physical and console access
Mitigation
For 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
Mitigation
Johnson 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).
Mitigation
Deploy devices only within isolated BAS/OT networks
Mitigation
Ensure no direct Internet exposure
Mitigation
Enforce strict VLAN segmentation from enterprise IT networks
Mitigation
Restrict access to trusted engineering workstations only
Mitigation
Block all remote login access from untrusted networks
Mitigation
Allow connections only from whitelisted IP addresses
Mitigation
Block all Internet-originated traffic
Mitigation
Prevent unauthorized lateral movement across networks
Mitigation
Restrict communication to required protocols only
Mitigation
Disable insecure services (e.g., Telnet), if enabled
Mitigation
Disable any unnecessary services or exposed ports
Mitigation
Monitor for repeated login attempts
Mitigation
Monitor for unauthorized or root-level access
Mitigation
Enable logging and centralized monitoring (where supported)
Mitigation
Restrict distribution of firmware images
Mitigation
Prevent unauthorized physical and console access
Mitigation
For 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 |
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. |