UI Enterprise Firewall Core Firmware vulnerabilities

5 CVEs affecting UI Enterprise Firewall Core Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-55110, published 2026-07-02.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2026-54402, published 2026-07-02. High severity, CVSS 8.8. EPSS: 1.8% chance of exploitation in the next 30 days. A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.
• CVE-2026-54403, published 2026-07-02. High severity, CVSS 8.6. EPSS: 0.8% chance of exploitation in the next 30 days. A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
• CVE-2026-54404, published 2026-07-02. High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days. A malicious actor with access to the network and low privileges could exploit a series of authenticated SQL Injection vulnerabilities found in UniFi OS to escalate privileges within such UniFi OS…
• CVE-2026-54401, published 2026-07-02. High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days. A malicious actor with access to the network and low privileges could exploit a Server-Side Request Forgery (SSRF) to escalate privileges within such UniFi OS devices or instances.
• CVE-2026-55110, published 2026-07-02. Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days. A malicious actor who lures an authenticated user to a malicious page could exploit a Cross-Origin Resource Sharing (CORS) misconfiguration found in UniFi OS to trigger actions in UniFi OS using that…