# CVE-2026-34493: Johnson Controls EasyIO FS32 debug interface information exposure

Source: https://junglewise.ai/threats/cve-2026-34493-on-chip-debug-interface-vulnerability-in-johnson-controls-easyio  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-34493 · Severity: info · Published 2026-10-01

Johnson Controls EasyIO FS32 is a building automation control module used to manage HVAC and other facility systems. An on-chip debug interface in this device can be accessed to extract sensitive data and configuration information. This could allow an attacker with physical access to the device to learn internal secrets or system details that could be used in further attacks.

Technologies: [Johnson Controls EasyIO FS32](https://junglewise.ai/threats/technologies/easyio-fs32). Vendors: [Johnson Controls](https://junglewise.ai/threats/vendors/johnson-controls).

## Quick answers

**Is CVE-2026-34493 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34493 being exploited in the wild.

**How severe is CVE-2026-34493?** Informational severity, published 1 October 2026.

**Which products and versions are affected?** Johnson Controls EasyIO FS32 before 3.3b63.

**Is there a fix for CVE-2026-34493?** Yes: fixed in 3.3b63. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34493 attacked?** It is attacked with physical access, in a network appliance.

**Am I affected by CVE-2026-34493?** Check whether you run Johnson Controls EasyIO FS32 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.3b63

## Technical details

An on-chip debug interface in EasyIO FS32 exposes a "Collect Data from Common Resource Locations" capability, allowing extraction of sensitive data through the debug interface. This vulnerability requires physical access to the device. The issue affects versions before 3.3b63, and no CVSS score has been assigned, indicating limited immediate exploitability or impact.

## Affected products

- Johnson Controls EasyIO FS32 before 3.3b63

## Timeline

- 2026-10-01: disclosed

## References

- [https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories](https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories)

## Related threats

- [Johnson Controls EasyIO FS32 path traversal](https://junglewise.ai/threats/cve-2026-71453-external-control-of-file-name-or-path-vulnerability-in-johnson)
- [Johnson Controls EasyIO FS32 OS command injection](https://junglewise.ai/threats/cve-2026-71452-os-command-injection-vulnerability-in-johnson-controls-easyio)
- [Johnson Controls EasyIO FS32 hardcoded cryptographic key](https://junglewise.ai/threats/cve-2026-71449-use-of-hard-coded-cryptographic-key-vulnerability-in-johnson)
- [Johnson Controls EasyIO FS32 insecure default initialization authentication abuse](https://junglewise.ai/threats/cve-2026-71448-insecure-default-initialization-of-resource-vulnerability-in)
- [Johnson Controls EasyIO FS32 OS command injection](https://junglewise.ai/threats/cve-2026-71451-os-command-injection-vulnerability-in-johnson-controls-easyio)