Is CVE-2007-5638 actively exploited?

No active exploitation of CVE-2007-5638 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2007-5638 be exploited remotely?

Yes. CVE-2007-5638 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2007-5638?

CVE-2007-5638 has a CVSS score of 4.3 (MEDIUM).

HOME VULNERABILITIESCVE-2007-5638

MEDIUM

CVE-2007-5638

CWE-200Published: October 23, 2007· Updated: Jun 16, 2026

4.3

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), 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.

NVD Source

Technical Analysis

CVE-2007-5638 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.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityM

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityP

IntegrityNone

AvailabilityNone

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

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