CVE-2019-25652

UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM

Published Mar 27, 2026 CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Ui
Ui unifi Network Controller
CPEs cpe:2.3:a:ui:unifi_network_controller:*:*:*:*:*:*:*:*
Vendors & Products Ui
Ui unifi Network Controller
Type Values Removed Values Added
Metrics cvssV4_0

{'score': 7.6, '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'}

cvssV4_0

{'score': 7.7, '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'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ubiquiti
Ubiquiti unifi Network Controller
Vendors & Products Ubiquiti
Ubiquiti unifi Network Controller
Type Values Removed Values Added
Description 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.
Title UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM
Weaknesses CWE-295
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.6, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Jul 15, 2026, 1:24 AM
Reserved
Mar 26, 2026, 8:33 PM
Status
Awaiting Analysis
Published
Mar 27, 2026, 10:16 PM
Modified
Jun 17, 2026, 2:32 AM