CVE-2004-0836: Debian Linux

High severity, CVSS 10.0. EPSS: 9.8% chance of exploitation in the next 30 days.

Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

Affected products

• Debian Debian Linux: version 3.0 only
• Oracle MySQL: from 3.20, before 3.23.49 (fixed in 3.23.49); from 4.0.0, before 4.0.21 (fixed in 4.0.21)

Published 2004-11-03. Last modified 2026-06-16.