CVE-2019-25652

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.

Score

CVSS 4.0 7.7 High

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-03-27

Last modified

2026-07-15

Weaknesses

CWE-295

Affected products

• Unifi Network Controller (Ui)

References

• https://community.ui.com/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391
• https://www.vulncheck.com/advisories/unifi-network-controller-improper-certificate-validation-leading-to-credential-the…