Johnson Controls CEM AC2000
Summary
Vulnerability reported (CVE-2026-21661). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
View CSAF Summary Successful exploitation of this vulnerability could allow a standard user to escalate privileges on the host machine. The following versions of Johnson Controls CEM AC2000 are affected: CEM AC2000 12.0 (CVE-2026-21661) CEM AC2000 11.0 (CVE-2026-21661) CEM AC2000 10.6 (CVE-2026-21661) CVSS Vendor Equipment Vulnerabilities v3 8.7 Johnson Controls Inc. Johnson Controls CEM AC2000 Uncontrolled Search Path Element Background Critical Infrastructure Sectors: Critical Manufacturing, Commercial Facilities, Government Services and Facilities, Transportation Systems, Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Ireland Vulnerabilities Expand All + CVE-2026-21661 The affected product is vulnerable to DLL hijacking, which could allow an attacker to escalate standard user privileges on the host machine. View CVE Details Affected Products Johnson Controls CEM AC2000 Vendor:Johnson Controls Inc. Product Version:Johnson Controls Inc. CEM AC2000: 12.0, Johnson Controls Inc. CEM AC2000: 11.0, Johnson Controls Inc. CEM AC2000: 10.6 Product Status:known_affected Remediations MitigationJohnson Controls recommends users apply the following mitigations: MitigationUpgrade CEM AC 2000 12.0 to 12.0 Release 10. MitigationUpgrade CEM AC 2000 11.0 to 11.0 Release 9. MitigationUpgrade CEM AC 2000 10.6 to 10.6 Release 3. MitigationFor more detailed mitigation instructions, please see Johnson Controls Product Security Advisory.https://www.johnsoncontrols.com/tr…
Source: CISA ICS Advisories NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-21661 has been found.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-21661" on the vendor's site.
CVE-2026-21661 — CWE-427
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-427) has been reported.
Check the vendor advisory for the affected versions.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- ICSA cisa.gov
- web productsecurity@jci.com