CVE-1999-1109: Sendmail

Medium severity, CVSS 5.0. EPSS: 7.2% chance of exploitation in the next 30 days.

Sendmail before 8.10.0 allows remote attackers to cause a denial of service by sending a series of ETRN commands then disconnecting from the server, while Sendmail continues to process the commands after the connection has been terminated.

Affected products

• Sendmail Sendmail: up to and including 8.10.0

Published 1999-12-22. Last modified 2026-06-16.