CVE-2019-25652 HIGH

CVE-2019-25652: UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM

Vendor Ubiquiti
Product UniFi Network Controller
Weakness CWE-295
Published March 27, 2026
Last update May 25, 2026

CVSS base score

7.7/10
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:N/SI:N/SA:N

What the vulnerability does

01Description

UniFi Network Controller before version 5.10.22 and 5.11.x before 5.11.18 contains an improper certificate verification vulnerability that allows adjacent network attackers to conduct man-in-the-middle attacks by presenting a false SSL certificate during SMTP connections. Attackers can intercept SMTP traffic and obtain credentials by exploiting the insecure SSL host verification mechanism in the SMTP certificate validation process.

Key dates

02Disclosure timeline

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