What’s Vulnerable › Vulnerabilities

CVE-2019-5456

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-30 · updated 2026-06-17
• Weakness: CWE-300

Description

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.

Affected products

• UniFi: through 5.10.21

References

• https://community.ui.com/releases/862b962b-55f6-4324-96be-610f647d5c1c
• https://community.ui.com/releases/9f698d0b-8279-40d3-9f1a-d36db4813124
• https://community.ui.com/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391
• https://hackerone.com/reports/519582
• https://community.ui.com/releases/862b962b-55f6-4324-96be-610f647d5c1c
• https://community.ui.com/releases/9f698d0b-8279-40d3-9f1a-d36db4813124
• https://community.ui.com/releases/Security-Advisory-Bulletin-003-003/982bbaa8-2a07-4f81-a5f6-0bb84753f391
• https://hackerone.com/reports/519582

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