CVE-2017-9801: Apache Commons Email

High severity, CVSS 7.5. EPSS: 6% chance of exploitation in the next 30 days.

When a call-site passes a subject for an email that contains line-breaks in Apache Commons Email 1.0 through 1.4, the caller can add arbitrary SMTP headers.

Affected products

• Apache Commons Email: version 1.0 only; version 1.1 only; version 1.2 only; version 1.3 only; version 1.3.1 only; version 1.3.2 only; …

Published 2017-08-07. Last modified 2026-06-17.