CVE-2021-43270: Datalust Seq.app.emailplus

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Datalust Seq.App.EmailPlus (aka seq-app-htmlemail) 3.1.0-dev-00148, 3.1.0-dev-00170, and 3.1.0-dev-00176 can use cleartext SMTP on port 25 in some cases where encryption on port 465 was intended.

Affected products

• Datalust Seq.app.emailplus: version 3.1.0 only

Published 2021-11-02. Last modified 2026-06-17.