Security readout for executives and security teams
Plain-English summary
CVE-2021-36201 lets an unauthenticated nearby attacker infer whether user accounts exist in Johnson Controls C•CURE 9000 Portal. This is not a system takeover, but it can help attackers build target lists for later credential attacks against physical security administration systems.
Executive priority
Treat this as a moderate-priority exposure management item. It does not indicate direct compromise, but it affects a physical security platform and can reduce attacker effort during credential-focused intrusion attempts.
Technical view
The issue is an observable response discrepancy, CWE-204, in C•CURE 9000 version 2.90 and earlier. CVSS 3.1 is 4.3 with adjacent attack vector, low complexity, no privileges, no user interaction, and low confidentiality impact only.
Likely exposure
Organizations running Johnson Controls C•CURE 9000 Portal version 2.90 or earlier are potentially exposed, especially where the portal is reachable from adjacent or poorly segmented networks. The sources do not identify affected CPEs or specific deployment configurations.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as CISA KEV. The main attacker value is account enumeration, which may support later phishing, password guessing, or credential-stuffing activity.
Researcher notes
Evidence supports account enumeration through response discrepancy only. Do not assume remote internet exploitation, code execution, integrity impact, availability impact, or active exploitation from the provided sources.
Mitigation direction
- Identify all C•CURE 9000 Portal deployments and versions.
- Review Johnson Controls and CISA guidance for supported updates or mitigations.
- Prioritize upgrading or remediating systems on version 2.90 or earlier.
- Restrict unnecessary network access to the C•CURE Portal.
- Monitor authentication and lookup activity for enumeration patterns.
Validation and detection
- Confirm whether C•CURE 9000 Portal is deployed.
- Verify each deployment version is newer than 2.90 or remediated.
- Check whether portal access is limited to trusted networks.
- Review logs for repeated account discovery or authentication anomalies.
- Document remediation status against the Johnson Controls advisory.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-204: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-36201 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.johnsoncontrols.com/cyber-solutions/security-advisoriesCVE reference
- ICS-CERT AdvisoryCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Observable Response Discrepancy
Observable Response Discrepancy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.