CVE-2007-5638

Exp

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), and other product lines, use only 65536 different values in the 32-bit ID number field of an RUDP datagram, which makes it easier for remote attackers to guess the RUDP ID and spoof messages. NOTE: this can be leveraged for an eavesdropping attack by sending many Open Audio Stream messages.

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-2007-5638 is rated Exploit Available (59.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.63%). 2 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-2007-5638

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

Exploit prediction scoring system (EPSS) score for CVE-2007-5638

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 2024-12-17 1.00% 0.63% -0.37%
2 2024-10-03 0.90% 1.00% +0.10%
3 2024-07-19 — 0.90% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-5638

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N 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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2007-5638

Affected software / configurations for CVE-2007-5638

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-2007-5638

cvelogic Threat Intelligence