CVE-1999-1553: Xcmail

High severity, CVSS 10.0. EPSS: 6% chance of exploitation in the next 30 days.

Buffer overflow in XCmail 0.99.6 with autoquote enabled allows remote attackers to execute arbitrary commands via a long subject line.

Affected products

• Xcmail Xcmail: version 0.99.6 only

Published 1999-05-01. Last modified 2026-06-16.