How severe is CVE-2026-33000?

CVE-2026-33000 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33000 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33000?

CVE-2026-33000 affects Ui Unifi Os Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33000?

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.

Does CVE-2026-33000 have an EU (EUVD) identifier?

Yes. CVE-2026-33000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31385.

When was CVE-2026-33000 published?

CVE-2026-33000 was published on 2026-05-22 and last updated on 2026-07-23.

CVE-2026-33000

CVE-2026-33000 is a critical-severity vulnerability in Ui Unifi Os Server with a CVSS 3.x base score of 9.1. 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: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31385
Weakness: CWE-20
Affected product: Ui Unifi Os Server
Published: 2026-05-22
Last modified: 2026-07-23

Description

A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.

Frequently asked questions

What is CVE-2026-33000?: A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
How severe is CVE-2026-33000?: CVE-2026-33000 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33000 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33000?: CVE-2026-33000 affects Ui Unifi Os Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33000?: 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.
Does CVE-2026-33000 have an EU (EUVD) identifier?: Yes. CVE-2026-33000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31385.
When was CVE-2026-33000 published?: CVE-2026-33000 was published on 2026-05-22 and last updated on 2026-07-23.

References

https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

Affected products (1)

cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*

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