CVE-2021-27663: Johnsoncontrols AC2000 Firmware

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability in versions 10.1 through 10.5 of Johnson Controls CEM Systems AC2000 allows a remote attacker to access to the system without adequate authorization. This issue affects: Johnson Controls CEM Systems AC2000 10.1; 10.2; 10.3; 10.4; 10.5.

Affected products

• Johnsoncontrols AC2000 Firmware: from 10.1, up to and including 10.5

Published 2021-08-30. Last modified 2026-06-17.