CVE-2025-52665

Q: How do I fix CVE-2025-52665?

Upgrade unifi access to 4.0.21 or later.

Q: Is CVE-2025-52665 being actively exploited?

Not that we know of. CVE-2025-52665 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 41.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

Q: How severe is CVE-2025-52665?

CVE-2025-52665 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-52665 affect?

Published advisories record a fix for unifi access (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 99th pctl

10.0

CVSS v3

NVD

Description

A malicious actor with access to the management network could exploit a misconfiguration in UniFi’s door access application, UniFi Access, that exposed a management API without proper authentication. This vulnerability was introduced in Version 3.3.22 and was fixed in Version 4.0.21 and later. Affected Products: UniFi Access Application (Version 3.3.22 through 3.4.31). Mitigation: Update your UniFi Access Application to Version 4.0.21 or later.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

unifi accessNVD

Affected:>= 3.3.22, < 4.0.21Fixed in:4.0.21CVE-2025-52665derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

40.97%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1

community.ui.com

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

Common questions

How do I fix CVE-2025-52665?

Upgrade unifi access to 4.0.21 or later.

Is CVE-2025-52665 being actively exploited?

Not that we know of. CVE-2025-52665 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 41.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2025-52665?

CVE-2025-52665 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-52665 affect?

Published advisories record a fix for unifi access (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2025-52665

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-12.