How severe is CVE-2021-27664?

CVE-2021-27664 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27664?

CVE-2021-27664 affects Johnsoncontrols Exacqvision Web Service. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27664?

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

When was CVE-2021-27664 published?

CVE-2021-27664 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-27664

CVE-2021-27664 is a critical-severity vulnerability in Johnsoncontrols Exacqvision Web Service with a CVSS 3.x base score of 9.8. 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-269.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Johnsoncontrols Exacqvision Web Service
Published: 2021-10-11
Last modified: 2026-06-17

Description

Under certain configurations an unauthenticated remote user could be given access to credentials stored in the exacqVision Server.

Frequently asked questions

What is CVE-2021-27664?: Under certain configurations an unauthenticated remote user could be given access to credentials stored in the exacqVision Server.
How severe is CVE-2021-27664?: CVE-2021-27664 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27664?: CVE-2021-27664 affects Johnsoncontrols Exacqvision Web Service. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27664?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27664 published?: CVE-2021-27664 was published on 2021-10-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:johnsoncontrols:exacqvision_web_service:*:*:*:*:*:*:*:*

More vulnerabilities in Johnsoncontrols Exacqvision Web Service

CVE-2024-32862 — Medium (CVSS 6.8): Under certain circumstances the ExacqVision Web Services does not provide sufficient protection from untrusted domains.
CVE-2024-32863 — Medium (CVSS 6.8): Under certain circumstances the exacqVision Web Services may be susceptible to Cross-Site Request Forgery (CSRF)
CVE-2020-9047 — Medium (CVSS 6.8): A vulnerability exists that could allow the execution of unauthorized code or operating system commands on systems…
CVE-2024-32864 — Medium (CVSS 6.4): Under certain circumstances exacqVision Web Services will not enforce secure web communications (HTTPS)
CVE-2024-32931 — Medium (CVSS 5.7): Under certain circumstances the exacqVision Web Service can expose authentication token details within communications.
CVE-2021-27659 — Medium (CVSS 5.3): exacqVision Web Service 21.03 does not sufficiently validate, filter, escape, and/or encode user-controllable input…

All CVEs affecting Johnsoncontrols Exacqvision Web Service →

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