CVE-2007-5591

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

2.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2007-10-19 23:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:46 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.3% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2007-10-19 23:17 UTC

Last modified

2026-06-16 22:46 UTC

Exploit probability

2.3% · EPSS, next 30 days

Record status

Modified

Affected

• Nortel Meridian Option 11c
• Nortel Meridian Option 51c
• Nortel Meridian Option 61c
• Nortel Meridian Option 81c
• Nortel voip-core-cs 1000e
• Nortel voip-core-cs 1000m
• Nortel voip-core-cs 1000s

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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