CVE-2003-1250: Efficient Networks 5861 DSL Router

Medium severity, CVSS 5.0. EPSS: 1.8% chance of exploitation in the next 30 days.

Efficient Networks 5861 DSL router, when running firmware 5.3.80 configured to block incoming TCP SYN, packets allows remote attackers to cause a denial of service (crash) via a flood of TCP SYN packets to the WAN interface using a port scanner such as nmap.

Affected products

• Efficient Networks 5861 DSL Router: version 5.3.80_firmware only

Published 2003-12-31. Last modified 2026-06-16.