CVE-2026-21655: Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9

This month

HIGH 8.7

CVE-2026-21655 is a high-severity flaw (CVSS 8.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9000, and Johnson Controls Victor Application Server allows capec-586. This issue affects victor: before 8.0; CCure 9000: before 3.2; Victor Application Server: before 4.1.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-23
Last modified	2026-10-24

Publisher (CNA): Johnson Controls

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-23 21:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21655?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-21655 being exploited?

CVE-2026-21655 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21655 affect?

CVE-2026-21655 affects affected software. Severity is high (CVSS 8.7). Deserialization of untrusted data vulnerability in Johnson Control victor on Windows, Johnson Controls CCure 9000, and Johnson Controls Victor Application Server allows capec-586. This issue affects victor: before 8.0; CCure 9000: before 3

How urgent is CVE-2026-21655?

Priority 41/100. High severity

Software pages

Windows vulnerabilities

References

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