How severe is CVE-2021-27665?

CVE-2021-27665 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-27665 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27665?

CVE-2021-27665 affects Johnsoncontrols Exacqvision Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27665?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-27665 published?

CVE-2021-27665 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-27665

CVE-2021-27665 is a high-severity vulnerability in Johnsoncontrols Exacqvision Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Johnsoncontrols Exacqvision Server
Published: 2021-10-11
Last modified: 2026-06-17

Description

An unauthenticated remote user could exploit a potential integer overflow condition in the exacqVision Server with a specially crafted script and cause denial-of-service condition.

Frequently asked questions

What is CVE-2021-27665?: An unauthenticated remote user could exploit a potential integer overflow condition in the exacqVision Server with a specially crafted script and cause denial-of-service condition.
How severe is CVE-2021-27665?: CVE-2021-27665 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-27665 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27665?: CVE-2021-27665 affects Johnsoncontrols Exacqvision Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27665?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-27665 published?: CVE-2021-27665 was published on 2021-10-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:johnsoncontrols:exacqvision_server:*:*:*:*:*:*:x86:*

More vulnerabilities in Johnsoncontrols Exacqvision Server

CVE-2024-32758 — High (CVSS 7.5): Under certain circumstances the communication between exacqVision Client and exacqVision Server will use insufficient…
CVE-2019-7590 — Medium (CVSS 6.7): ExacqVision Server’s services 'exacqVisionServer', 'dvrdhcpserver' and 'mdnsresponder' have an unquoted service path.…
CVE-2024-32865 — Medium (CVSS 6.4): Under certain circumstances the exacqVision Server will not properly validate TLS certificates provided by connected…

All CVEs affecting Johnsoncontrols Exacqvision Server →

Other CWE-190 (Integer Overflow or Wraparound) vulnerabilities

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CVE-2025-64721 — Critical (CVSS 10.0): Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. In versions…
CVE-2015-5108 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
CVE-2015-5097 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
CVE-2013-2555 — Critical (CVSS 10.0): Integer overflow in Adobe Flash Player before 10.3.183.75 and 11.x before 11.7.700.169 on Windows and Mac OS X, before…

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