Is CVE-2026-34909 in the CISA KEV catalog?

Yes. CVE-2026-34909 is on the CISA Known Exploited Vulnerabilities list, added 2026-06-23.

What is the CVSS severity of CVE-2026-34909?

CVE-2026-34909 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2026-34909?

CVE-2026-34909 has an EPSS score of 2.27% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34909?

Upgrade enterprise fortress gateway firmware to 5.1.12 or later. Fixes are available for 32 affected products.

CVE & CISA-KEV Catalog

CVE-2026-34909

CRITICALCISA KEVEPSS 81th pctl

10.0

CVSS v3

NVD

Description

A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.

CWE-22Path Traversal

How to fix

Remediation Available

enterprise fortress gateway firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

enterprise network video recorder core firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

enterprise network video recorder firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unas 2 firmwareNVD

Affected:< 5.1.10Fixed in:5.1.10CVE-2026-34909derived from NVD

unas 4 firmwareNVD

Affected:< 5.1.10Fixed in:5.1.10CVE-2026-34909derived from NVD

unas pro 4 firmwareNVD

Affected:< 5.1.10Fixed in:5.1.10CVE-2026-34909derived from NVD

unas pro 8 firmwareNVD

Affected:< 5.1.10Fixed in:5.1.10CVE-2026-34909derived from NVD

unas pro firmwareNVD

Affected:< 5.1.10Fixed in:5.1.10CVE-2026-34909derived from NVD

unifi cloud gateway fiber firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloud gateway industrial firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloud gateway max firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloud gateway ultra firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloud key plus firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloudkey enterprise firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi cloudkey firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream machine beast firmwareNVD

Affected:< 5.1.11Fixed in:5.1.11CVE-2026-34909derived from NVD

unifi dream machine firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream machine pro firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream machine pro max firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream machine special edition firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream router 5g max firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream router 7 firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream router firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi dream wall firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi express 7 firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi express firmwareNVD

Affected:< 4.0.14Fixed in:4.0.14CVE-2026-34909derived from NVD

unifi network video recorder firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi network video recorder g2 firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi network video recorder g2 pro firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi network video recorder instant firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi network video recorder pro firmwareNVD

Affected:< 5.1.12Fixed in:5.1.12CVE-2026-34909derived from NVD

unifi os serverNVD

Affected:< 5.0.8Fixed in:5.0.8CVE-2026-34909derived 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

2.27%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-06-26

References

Patch1

community.ui.com

Exploit1

pwndefend.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-22 (Path Traversal) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-23897	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-32315	High	8.6	100%	KEV	Fix
CVE-2022-29464	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-26086	Medium	5.3	100%	KEV	Fix
CVE-2021-22005	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-5902	Critical	9.8	100%	KEV + Ransom	Fix

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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 2026-06-24.