Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote attacker crash an affected exacqVision service, disrupting video/security operations. The public record describes denial of service only, not data theft or system takeover. Business urgency is highest where exacqVision is reachable from untrusted networks or supports critical physical security monitoring.
Executive priority
Treat as a high-priority availability risk for physical security environments. Prioritize exposed or mission-critical camera/video management systems first. The record supports denial-of-service impact, not confidentiality compromise, so urgency should be driven by operational dependence and network exposure.
Technical view
CVE-2021-27665 is a CWE-190 integer overflow affecting Johnson Controls exacqVision Web Service 21.06.11.0, described as exacqVision Server 32-bit. The CVSS 3.1 score is 7.5, with network access, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely in organizations running Johnson Controls exacqVision Web Service 21.06.11.0, particularly 32-bit server deployments. The source bundle does not prove other versions are affected. Internet-facing or broadly reachable installations carry higher operational risk because exploitation requires no authentication.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Public descriptions say a specially crafted script can trigger denial of service, but the provided sources do not include exploit maturity, exploitation volume, or detailed attack prerequisites beyond network reachability.
Researcher notes
Evidence is limited to the CVE description and advisories in the source bundle. The affected entry names Johnson Controls exacqVision Web Service 21.06.11.0, while the title references exacqVision Server 32-bit. Validate product naming and fixed-version guidance directly with Johnson Controls.
Mitigation direction
- Check Johnson Controls security advisories for fixed versions or vendor-approved mitigations.
- Update affected exacqVision Web Service deployments following Johnson Controls guidance when available.
- Restrict exacqVision service access to trusted management networks and required clients.
- Remove unnecessary internet exposure using firewall, VPN, or access-control policy.
- Monitor service availability and restart/crash patterns until remediation is complete.
Validation and detection
- Inventory exacqVision Web Service deployments and confirm installed version numbers.
- Determine whether any affected deployment is a 32-bit exacqVision Server instance.
- Verify whether the service is reachable from the internet or untrusted networks.
- Review logs and monitoring for unexplained service crashes or restarts.
- Confirm remediation status against Johnson Controls and ICS-CERT advisory guidance.
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-190: 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-2021-27665 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.