CVE-2021-44527: UI UniFi Switch Firmware

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability found in UniFi Switch firmware Version 5.43.35 and earlier allows a malicious actor who has already gained access to the network to perform a Deny of Service (DoS) attack on the affected switch.This vulnerability is fixed in UniFi Switch firmware 5.76.6 and later.

Affected products

• UI UniFi Switch Firmware: before 5.76.6 (fixed in 5.76.6)

Published 2021-12-07. Last modified 2026-06-17.