UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM
Priority LOW 34CWE-295Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00116 1st percentileScored 2026-11-07
Fix Fixed UniFi Network Controller (Ubiquiti): 5.6.42, 5.10.22, 5.11.18
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Ubiquiti | UniFi Network Controller | before 5.6.42; 5.6.43 to before 5.10.22; 5.11 to before 5.11.18 | 5.6.42, 5.10.22, 5.11.18 | Patch available | CNA |
- UniFi Network Controller VendorUbiquiti Affected before 5.6.42; 5.6.43 to before 5.10.22; 5.11 to before 5.11.18 Fixed in 5.6.42, 5.10.22, 5.11.18 Patch available CNA
Remediation
- Fix · CNA UniFi Network Controller (Ubiquiti) Fixed in 5.6.42, 5.10.22, 5.11.18
Timeline
- 2026-10-02 Threatist record created from CVE-2019-25652
- 2026-10-03 Alias added: GHSA-cwvv-m84p-3r2p
References
More Ubiquiti vulnerabilities
- TI-2026-27142 Improper input validation in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2026-27141 Path traversal in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2026-27140 Improper access control in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2010-05027 On certain Ubiquiti devices, Command Injection exists via a GET request to stainfo.cgi… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-19187 AirControl 1.4.2 - PreAuth Remote Code Execution CVSS 4.0CRITICAL 9.3
- TI-2015-07644 Ubiquiti airOS HTTP(S) unauthenticated arbitrary file upload CVSS 3.0CRITICAL 9.8
Sources
- CVE-2019-25652 · CVE Program
- CVE-2019-25652 · NVD
- FIRST EPSS
- GHSA-cwvv-m84p-3r2p · GitHub Advisory Database · CC BY 4.0
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