Ubiquiti UniFi Gateways: Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2026-3511 · first 23.09.2026 · updated 23.09.2026 · CVSS 7,5
What it is about
UniFi ist Ubiquiti's End-to-End-Netzwerk-Ökosystem für Unternehmen und Smart Homes. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Ubiquiti UniFi Gateways ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Ubiquiti UniFi Gateways <5.1.26
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Ubiquiti UniFi Gateways 5.1.26
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
CVE: CVE-2026-77544, CVE-2026-77555, CVE-2026-77556, CVE-2026-77558, CVE-2026-95861, CVE-2026-95862
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.