Physical access to unrestricted debug functionality
Published Aug 27, 2026 · Updated Aug 27, 2026
Improper access control in Johnson Controls T2000 before 31.6 allows physically proximate attackers to access unrestricted debug functions. The device's debug and test interface exposes those functions without properly enforcing its access-control list. Physical access to the thermostat is required, and Johnson Controls has not disclosed which debug operations become available or how they alter device behavior.
Summary
What happened
Improper access control in Johnson Controls T2000 before 31.6 allows physically proximate attackers to access unrestricted debug functions. The device's debug and test interface exposes those functions without properly enforcing its access-control list. Physical access to the thermostat is required, and Johnson Controls has not disclosed which debug operations become available or how they alter device behavior.
The record
- CVE
- CVE-2026-64896
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- Johnson Controls
- Product
- T2000 Fan Coil Thermostat
- Classifications
- Unavailable
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <31.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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