{"id":"CVE-2019-25652","aliases":["EUVD-2019-20043","GHSA-cwvv-m84p-3r2p"],"status":"published","title":"UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM","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.","severity":{"version":"4.0","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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00116,"percentile":0.01615,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-295"],"published":"2026-03-27T21:19:26Z","modified":"2026-07-15T01:24:06Z","products":[{"vendor":"ubiquiti","product":"unifi network controller"}],"references":[{"url":"https://community.ui.com/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391","tags":["vendor-advisory"]},{"url":"https://www.vulncheck.com/advisories/unifi-network-controller-improper-certificate-validation-leading-to-credential-theft-via-mitm","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-25652"},{"url":"https://github.com/advisories/GHSA-cwvv-m84p-3r2p"}],"sources":{"cve":[{"id":"CVE-2019-25652","title":"UniFi Network Controller Improper Certificate Validation Leading to Credential Theft via MITM","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.","status":"published","published":"2026-03-27T21:19:26.49Z","modified":"2026-07-15T01:24:06.306Z","cvss":[{"version":"4.0","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","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:20:19.399352Z"}],"euvd":[{"id":"EUVD-2019-20043","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.","status":"published","published":"2026-03-27T21:19:26Z","modified":"2026-07-15T01:24:06Z","cvss":[{"version":"4.0","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","level":"high"}],"updated_at":"2026-11-02T18:19:54.771384Z"}],"ghsa":[{"id":"GHSA-cwvv-m84p-3r2p","title":"UniFi Network Controller before version 5.10.22 and 5.11.x before 5.11.18 contains an improper...","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.","status":"published","published":"2026-03-28T00:31:15Z","modified":"2026-03-28T00:31:19Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:06:54.610516Z"}],"nvd":[{"id":"CVE-2019-25652","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.","status":"published","published":"2026-03-27T22:16:19.38Z","modified":"2026-06-17T02:32:53.637Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:05:50.275357Z"}]}}