CVE-2019-25651 CRITICAL

CVE-2019-25651: Ubiquiti UniFi Devices Use of AES-CBC Allows Key Recovery and Unauthorized Device Control

Vendor Ubiquiti
Product UniFi Network Controller
Weakness CWE-327 · Broken crypto
Published March 27, 2026
Last update May 25, 2026

CVSS base score

9.0/10
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
May 25, 2026 Record updated