CVE-2019-5456 json
SMTP MITM refers to a malicious actor setting up an SMTP proxy server between the UniFi Controller version <= 5.10.21 and their actual SMTP…
published 2019-07-30 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-15040
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
SMTP MITM refers to a malicious actor setting up an SMTP proxy server between the UniFi Controller version <= 5.10.21 and their actual SMTP server to record their SMTP credentials for malicious use later.
Exploit prediction
1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:P/I:N/A:N |
Affected products
- UniFi UniFi
Classification
References
-
community.ui.com
/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391
vendor-advisory
-
community.ui.com
/releases/862b962b-55f6-4324-96be-610f647d5c1c
release-notes, vendor-advisory
-
community.ui.com
/releases/9f698d0b-8279-40d3-9f1a-d36db4813124
release-notes, vendor-advisory
-
hackerone.com
/reports/519582
permissions-required
Sources
- CVE List CVE-2019-5456
- NVD CVE-2019-5456
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.