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CVE-2007-5638

14
FAUCET Score

CVE-2007-5638 describes a vulnerability in various Nortel IP phones and communication products where the RUDP datagram's 32-bit ID field uses only 65,536 distinct values, making it susceptible to ID guessing and message spoofing. This flaw, with a CVSS score of 4.3 (medium severity), could enable remote attackers to eavesdrop on communications by sending numerous "Open Audio Stream" messages, requiring moderate attack complexity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
50CPE matchmatch criteria
cpe:2.3:a:nortel:business_communications_manager:50:*:*:*:*:*:*:*
50aCPE matchmatch criteria
cpe:2.3:a:nortel:business_communications_manager:50a:*:*:*:*:*:*:*
50eCPE matchmatch criteria
cpe:2.3:a:nortel:business_communications_manager:50e:*:*:*:*:*:*:*
200CPE matchmatch criteria
cpe:2.3:a:nortel:business_communications_manager:200:*:*:*:*:*:*:*
400CPE matchmatch criteria
cpe:2.3:a:nortel:business_communications_manager:400:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 44th percentile among its peer group of 19,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

osvdb.org / 41770
secunia.com / advisories/27234
PatchVendor Advisory
securityreason.com / securityalert/3272
exchange.xforce.ibmcloud.com / vulnerabilities/37255
exchange.xforce.ibmcloud.com / vulnerabilities/42881
csnc.ch / static/advisory/csnc/nortel_IP_phone_surveillance_mode_v1.0.txt
Exploit
securityfocus.com / archive/1/482478/100/0/threaded
securityfocus.com / bid/26120
Exploit