CVE-2007-5591: Nortel Meridian Option 11c

High severity, CVSS 7.8. EPSS: 2.3% chance of exploitation in the next 30 days.

The CS1000 signaling server in Nortel Enterprise VoIP-Core-CS 1000M Chassis/Cabinet, Enterprise VoIP-Core-CS 1000E and 1000S, Meridian-Core-Option 11C Chassis and Cabinet, and Meridian-Core-Option 51C, 61C, and 81C allows remote attackers to cause a denial of service (telephony application outage) via a flood of packets to Embedded LAN (ELAN) ports.

Affected products

• Nortel Meridian Option 11c: any version
• Nortel Meridian Option 51c: any version
• Nortel Meridian Option 61c: any version
• Nortel Meridian Option 81c: any version
• Nortel Voip-Core-Cs: version 1000e only; version 1000m only; version 1000s only

Published 2007-10-19. Last modified 2026-06-16.