CVE-2007-5639

Exp

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and other Nortel IP Phone, Mobile Voice Client, and WLAN Handsets products allow remote attackers to cause a denial of service (device hang) via a flood of Mute and UnMute messages that have a spoofed source IP address for the Signaling Server.

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-2007-5639 is rated High Exploit Risk (70.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.21%). 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-2007-5639

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

Exploit prediction scoring system (EPSS) score for CVE-2007-5639

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 2026-02-05 1.26% 1.21% -0.05%
2 2025-05-26 1.05% 1.26% +0.21%
3 2025-03-30 — 1.05% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-5639

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-2007-5639

Affected software / configurations for CVE-2007-5639

Vendor Product Version Raw CPE
nortel ip_softphone_2050 — cpe:2.3:a:nortel:ip_softphone_2050:*:*:*:*:*:*:*:*
nortel mobile_voice_client_2050 — cpe:2.3:a:nortel:mobile_voice_client_2050:*:*:*:*:*:*:*:*

References for CVE-2007-5639

cvelogic Threat Intelligence