Is CVE-2026-21655 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-21655 being exploited in the wild.

How severe is CVE-2026-21655?

Informational severity, with a CVSS score of 8.7, published 23 July 2026.

Which products and versions are affected?

Johnson Controls Victor 2.9 to 3.0.

Is there a fix for CVE-2026-21655?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-21655 attacked?

It is attacked from the adjacent network, in an operating system.

Am I affected by CVE-2026-21655?

Check whether you run Johnson Controls Victor 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.

CVE-2026-21655: Johnson Controls victor Deserialization of Untrusted Data on Windows

CVE-2026-21655 · Severity: info · CVSS 8.7 · Published 2026-07-23

Johnson Controls victor is a video management system used to manage security cameras and surveillance data on Windows platforms. A vulnerability in how the software processes data could allow an attacker on the same local network to take control of the system. This could lead to unauthorized access to surveillance feeds, data theft, or disruption of security operations.

Vendors: Johnson Controls.

Quick answers

Is CVE-2026-21655 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-21655 being exploited in the wild.
How severe is CVE-2026-21655?: Informational severity, with a CVSS score of 8.7, published 23 July 2026.
Which products and versions are affected?: Johnson Controls Victor 2.9 to 3.0.
Is there a fix for CVE-2026-21655?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-21655 attacked?: It is attacked from the adjacent network, in an operating system.
Am I affected by CVE-2026-21655?: Check whether you run Johnson Controls Victor 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.

Technical details

A deserialization vulnerability (CWE-502) exists in Johnson Controls victor running on Windows. The flaw stems from the application improperly processing serialized data from untrusted sources, which can be leveraged by an attacker to achieve remote code execution (CAPEC-586). The attack vector is restricted to the adjacent network (AV:A), but requires no authentication or user interaction. The vulnerability affects versions 2.9 through 3.0. Users are advised to consult Johnson Controls security advisories for patching information.

Affected products

Johnson Controls victor 2.9 to 3.0

Timeline

2026-07-23: advisory: Initial disclosure by Johnson Controls and NVD publication.

References

https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

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