Is CVE-2007-5640 actively exploited?

No active exploitation of CVE-2007-5640 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2007-5640 be exploited remotely?

Yes. CVE-2007-5640 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2007-5640?

CVE-2007-5640 has a CVSS score of 7.1 (HIGH).

HOME VULNERABILITIESCVE-2007-5640

HIGH

CVE-2007-5640

NVD-CWE-noinfoPublished: October 23, 2007· Updated: Jun 16, 2026

7.1

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2007-5640 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityM

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityNone

IntegrityNone

AvailabilityC

AV:N/AC:M/Au:N/C:N/I:N/A:C

Affected Vendors & Products

nortel26 product(s)

multimedia communication server 5100multimedia communication server 5200communications serverip audio conference phone 2033ip phone 1110ip phone 1120eip phone 1140eip phone 1150eip phone 2001ip phone 2002ip phone 2004ip phone 2007+14

Source: NVD CPE · 36 total CPE entries