High severity8.6NVD Advisory· Published Sep 15, 2021· Updated Jun 17, 2026
CVE-2021-27662
CVE-2021-27662
Description
The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- cpe:2.3:o:johnsoncontrols:kantech_kt-1_door_controller_firmware:*:*:*:*:*:*:*:*Range: <=3.01
<=3.01+ 1 more
- (no CPE)range: <=3.01
- (no CPE)range: all versions up to and including 3.01
Patches
Vulnerability mechanics
References
2- us-cert.gov/ics/advisoriesnvdThird Party AdvisoryUS Government Resource
- www.johnsoncontrols.com/cyber-solutions/security-advisoriesnvdVendor Advisory
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