How severe is CVE-2026-54405?

CVE-2026-54405 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-2026-54405 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54405?

CVE-2026-54405 affects Ui Unifi Network Application. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54405?

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-2026-54405 published?

CVE-2026-54405 was published on 2026-07-02.

CVE-2026-54405

CVE-2026-54405 is a high-severity vulnerability in Ui Unifi Network Application 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Ui Unifi Network Application
Published: 2026-07-02
Last modified: 2026-07-02

Description

A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Network Application to execute a Denial of Service (DoS) attack on the application.

Frequently asked questions

What is CVE-2026-54405?: A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Network Application to execute a Denial of Service (DoS) attack on the application.
How severe is CVE-2026-54405?: CVE-2026-54405 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-2026-54405 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54405?: CVE-2026-54405 affects Ui Unifi Network Application. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54405?: 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-2026-54405 published?: CVE-2026-54405 was published on 2026-07-02.

References

https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc

Affected products (1)

cpe:2.3:a:ui:unifi_network_application:*:*:*:*:*:*:*:*

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