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CVE-2026-21661

AC2000 Uncontrolled Search Path Element

HIGH
8.4
CVSS Score
Published: May 6, 2026 at 04:21 PM UTC
Updated: October 26, 2026 at 07:10 PM UTC
1 product affected across 1 vendorCEM Systems AC2000

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Severity
HIGH8.4
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

Uncontrolled Search Path Element vulnerability in JohnsonControls AC2000 on Windows allows Leveraging/Manipulating Configuration File Search Paths. This issue affects AC2000: from 10.6 before release 10, from 11.0 before release 9, from 12 before release 3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

CEM Systems AC2000· Johnsoncontrols
90%
10.6 ≤ v < release 1011.0 ≤ v < release 912 ≤ v < release 310.611.012
Affected range stops below release 10, so it looks safe — our inference, not a vendor statement
Affected range stops below release 3, so it looks safe — our inference, not a vendor statement
Affected range stops below release 9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.4HIGHjci
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-427

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