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.
Published: 2026-03-27
Score: 7.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 12 May 2026 21:30:00 +0000

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'}


Mon, 30 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 30 Mar 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Ubiquiti
Ubiquiti unifi Network Controller
Vendors & Products Ubiquiti
Ubiquiti unifi Network Controller

Sat, 28 Mar 2026 03:15:00 +0000

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'}


Subscriptions

Ubiquiti Unifi Network Controller
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-14T02:06:36.102Z

Reserved: 2026-03-26T20:33:10.586Z

Link: CVE-2019-25652

cve-icon Vulnrichment

Updated: 2026-03-30T13:56:48.055Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-27T22:16:19.380

Modified: 2026-03-30T13:26:07.647

Link: CVE-2019-25652

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T23:15:27Z

Weaknesses