CVE-2007-5591

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.

Published: 2007-10-19 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-5591 is rated Moderate Risk (59.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.29%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2007-5591

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.72% 2.29% -0.43%
2 2026-06-07 2.61% 2.72% +0.10%
3 2025-11-13 — 2.61% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-5591

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2007-5591

Affected software / configurations for CVE-2007-5591

Vendor Product Version Raw CPE
nortel meridian_option_11c — cpe:2.3:a:nortel:meridian_option_11c:*:*:*:*:*:*:*:*
nortel meridian_option_51c — cpe:2.3:a:nortel:meridian_option_51c:*:*:*:*:*:*:*:*
nortel meridian_option_61c — cpe:2.3:a:nortel:meridian_option_61c:*:*:*:*:*:*:*:*
nortel meridian_option_81c — cpe:2.3:a:nortel:meridian_option_81c:*:*:*:*:*:*:*:*
nortel voip-core-cs 1000e cpe:2.3:a:nortel:voip-core-cs:1000e:*:enterprise:*:*:*:*:*
nortel voip-core-cs 1000m cpe:2.3:a:nortel:voip-core-cs:1000m:*:enterprise:*:*:*:*:*
nortel voip-core-cs 1000s cpe:2.3:a:nortel:voip-core-cs:1000s:*:enterprise:*:*:*:*:*

References for CVE-2007-5591

cvelogic Threat Intelligence