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CVE-2019-25652

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

HIGH
7.5
CVSS Score
Published: March 27, 2026 at 09:19 PM UTC
Updated: June 17, 2026 at 02:32 AM UTC
2 products affected across 2 vendorsUnifi Network ControllerUniFi Network Application

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Severity
HIGH7.5
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Unifi Network Controller· UI
95%
v < 5.6.425.11 ≤ v < 5.11.185.6.43 ≤ v < 5.10.22
Affected range stops below 5.10.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.11.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.6.42, so it looks safe — our inference, not a vendor statement
UniFi Network Application· Ubiquiti
60%
v < 5.6.425.11 ≤ v < 5.11.185.6.43 ≤ v < 5.10.225.115.6.43
Affected range stops below 5.10.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.11.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.6.42, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://community.ui.com/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/unifi-network-controller-improper-certificate-validation-leading-to-credential-theft-via-mitm

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHVulnCheck
Attack Vector
ADJACENT_NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-295

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