AC2000 Uncontrolled Search Path Element

Answer in brief

CVE-2026-21661 records a Unknown severity vulnerability in AC2000 Uncontrolled Search Path Element. The current sources do not mark it as known exploited. The current feed maps Johnson Controls/AC2000 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 6, 2026Updated Aug 24, 2026Source checked Aug 24, 2026First seen by HOL Aug 24, 2026Material review Aug 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Johnson Controls/AC2000 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Johnson Controls/AC2000generic	>=10.6 <release 10 \|\| >=11.0 <release 9 \|\| >=12 <release 3	release 10, release 9, release 3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Johnson Controls/AC2000.
Review the reported fix. Update Johnson Controls/AC2000 to release 10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 24, 2026

Sources and claim methodology

Source referencejohnsoncontrols.com

Upstream source description

An 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.

Quoted source text, attributed separately from HOL analysis.