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VulnerabilitiesOct 6, 2026

Johnson Controls EasyIO FG

Johnson Controls EasyIO FG firmware vulnerable to unauthorized access due to hard-coded credentials.

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.

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The lesson from this incident

Full lesson

The Johnson Controls EasyIO FG firmware contains hard-coded credentials and improper privilege management flaws, meaning any attacker who discovers these embedded credentials can gain full, unrestricted access to affected devices — no exploitation sophistication required. Because the product line is End-of-Life with no patches forthcoming, every unit still in production remains permanently vulnerable. This situation exemplifies the compounding risk of running unsupported OT/IoT devices in operational environments, where legacy hardware often persists well beyond its intended lifespan. Organizations that fail to track asset lifecycle status expose themselves to known, unmitigable vulnerabilities that attackers can trivially exploit.

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Indicators of Compromise

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

Entities

EasyIO FG firmware (product)Johnson Controls (vendor)EasyIO Neo R1 Series (product)