CVE-2019-25651: Ubiquiti UniFi Network Controller

High severity, CVSS 8.3. EPSS: 0.1% chance of exploitation in the next 30 days.

Ubiquiti UniFi Network Controller prior to 5.10.12 (excluding 5.6.42), UAP FW prior to 4.0.6, UAP-AC, UAP-AC v2, and UAP-AC Outdoor FW prior to 3.8.17, USW FW prior to 4.0.6, USG FW prior to 4.4.34 uses AES-CBC encryption for device-to-controller communication, which contains cryptographic weaknesses that allow attackers to recover encryption keys from captured traffic. Attackers with adjacent network access can capture sufficient encrypted traffic and exploit AES-CBC mode vulnerabilities to derive the encryption keys, enabling unauthorized control and management of network devices.

Affected products

• Ubiquiti UniFi Network Controller: before 5.6.42 (fixed in 5.6.42); from 5.6.43, before 5.10.12 (fixed in 5.10.12)
• Ubiquiti UniFi Uap-Ac Firmware: before 3.8.17 (fixed in 3.8.17)
• Ubiquiti UniFi Uap Firmware: before 4.0.6 (fixed in 4.0.6)
• Ubiquiti UniFi Usg Firmware: before 4.4.34 (fixed in 4.4.34)
• Ubiquiti UniFi Usw Firmware: before 4.0.6 (fixed in 4.0.6)

Published 2026-03-27. Last modified 2026-06-17.