Security readout for executives and security teams
Plain-English summary
Johnson Controls exacqVision Web Service versions up to and including 21.03 may place user-controlled input into web pages without sufficient validation or encoding. This can let an attacker influence page content and cause limited integrity impact. The provided sources rate it medium, not business-critical by itself, but it matters for exposed physical security systems.
Executive priority
Treat as a moderate-priority remediation item. It is not KEV-listed in the supplied data, but it affects security video infrastructure and has unauthenticated network attack characteristics in the CVSS score.
Technical view
CVE-2021-27659 is a CWE-79 issue in exacqVision Web Service through 21.03. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, score 5.3. The flaw concerns insufficient validation, filtering, escaping, or encoding before user-controllable input is served in web output.
Likely exposure
Organizations running Johnson Controls exacqVision Web Service 21.03 or earlier are potentially exposed, especially when the web service is reachable from untrusted networks or broad internal user populations.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Public scoring indicates network reachability, low attack complexity, no privileges, and low integrity impact. Evidence provided does not support claims of data theft or service disruption.
Researcher notes
The evidence supports CWE-79 output handling weakness and affected versions through 21.03. The bundle does not include specific vulnerable parameters, payloads, proof-of-concept status, or exact fixed version details, so validation should stay version- and exposure-focused.
Mitigation direction
- Identify all exacqVision Web Service deployments and versions.
- Review Johnson Controls and CISA advisory guidance for fixed releases or workarounds.
- Prioritize remediation for internet-facing or broadly accessible web services.
- Restrict web service access to trusted management networks where feasible.
- Monitor vendor advisories for updated remediation instructions.
Validation and detection
- Confirm whether any deployment runs version 21.03 or earlier.
- Verify web service exposure from internet, VPN, and internal user networks.
- Check asset inventory against Johnson Controls advisory scope.
- Review web logs for suspicious input patterns without reproducing exploit behavior.
- Document remediation status and remaining compensating controls.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-27659 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.johnsoncontrols.com/cyber-solutions/security-advisoriesCVE reference · x_refsource_CONFIRM
- ICS-CERT AdvisoryCVE reference · third-party-advisory, x_refsource_CERT
- ICS-CERT AdvisoryCVE reference · third-party-advisory, x_refsource_CERT
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.