CVE-2007-5640

Exp

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile Voice Client, and other product lines, allow remote attackers to block calls and force re-registration via a resume message to the Signaling Server that has a spoofed source IP address for the phone. NOTE: the attack is more disruptive if a new spoofed resume message is sent after each re-registration.

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

CVE-2007-5640 is rated High Exploit Risk (70.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.17%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2007-5640

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2007-5640

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 2025-03-30 0.92% 1.17% +0.26%
2 2025-03-29 1.17% 0.92% -0.26%
3 2025-03-17 — 1.17% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-5640

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 2.0 HIGH
AV:N/AC:M/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:M)
Exploitation needs some favorable conditions, but not exceptional ones.
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.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2007-5640

Affected software / configurations for CVE-2007-5640

Vendor Product Version Raw CPE
nortel business_communications_manager 50 cpe:2.3:a:nortel:business_communications_manager:50:*:*:*:*:*:*:*
nortel business_communications_manager 50a cpe:2.3:a:nortel:business_communications_manager:50a:*:*:*:*:*:*:*
nortel business_communications_manager 50e cpe:2.3:a:nortel:business_communications_manager:50e:*:*:*:*:*:*:*
nortel business_communications_manager 200 cpe:2.3:a:nortel:business_communications_manager:200:*:*:*:*:*:*:*
nortel business_communications_manager 400 cpe:2.3:a:nortel:business_communications_manager:400:*:*:*:*:*:*:*
nortel business_communications_manager 1000 cpe:2.3:a:nortel:business_communications_manager:1000:*:*:*:*:*:*:*
nortel business_communications_manager srg50 cpe:2.3:a:nortel:business_communications_manager:srg50:*:*:*:*:*:*:*
nortel business_communications_manager srg200 cpe:2.3:a:nortel:business_communications_manager:srg200:*:*:*:*:*:*:*
nortel centrex_ip_client_manager — cpe:2.3:a:nortel:centrex_ip_client_manager:*:*:*:*:*:*:*:*
nortel centrex_ip_element_manager — cpe:2.3:a:nortel:centrex_ip_element_manager:*:*:*:*:*:*:*:*
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 meridian_sl100 cs2100 cpe:2.3:a:nortel:meridian_sl100:cs2100:*:*:*:*:*:*:*
nortel mobile_voice_client_2050 — cpe:2.3:a:nortel:mobile_voice_client_2050:*:*:*:*:*:*:*:*

References for CVE-2007-5640

cvelogic Threat Intelligence