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Vulnerability record · CVE-2007-5636 · published 23 October 2007

CVE-2007-5636: Nortel ip softphone 2050 memory buffer overflow vulnerability

Nortel · Ip Softphone 2050

Buffer overflow in the Nortel UNIStim IP Softphone 2050 allows remote attackers to cause a denial of service (application abort) and possibly execute arbitrary code via a flood of invalid characters to the RTCP port (5678/udp) that triggers a Windows error message, aka "extraneous messaging."

7.5 CVSS 2.0 High EPSS 6.7% · top 6.3% CWE-119 · Memory buffer overflow
7.5CVSS 2.0 base score
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Buffer overflow in the Nortel UNIStim IP Softphone 2050 allows remote attackers to cause a denial of service (application abort) and possibly execute arbitrary code via a flood of invalid characters to the RTCP port (5678/udp) that triggers a Windows error message, aka "extraneous messaging."

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://osvdb.org/38521
http://secunia.com/advisories/27252 Vendor Advisory
http://securityreason.com/securityalert/3271
http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=655203
http://www.csnc.ch/static/advisory/csnc/nortel_UNIStim_IP_softphone_buffer-overflow_v1.0.txt Exploit
http://www.securityfocus.com/archive/1/482476/100/0/threaded
http://www.securityfocus.com/bid/26118 Exploit
http://www.vupen.com/english/advisories/2007/3540
https://exchange.xforce.ibmcloud.com/vulnerabilities/37256
http://osvdb.org/38521
http://secunia.com/advisories/27252 Vendor Advisory
http://securityreason.com/securityalert/3271
http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=655203
http://www.csnc.ch/static/advisory/csnc/nortel_UNIStim_IP_softphone_buffer-overflow_v1.0.txt Exploit
http://www.securityfocus.com/archive/1/482476/100/0/threaded
http://www.securityfocus.com/bid/26118 Exploit
http://www.vupen.com/english/advisories/2007/3540
https://exchange.xforce.ibmcloud.com/vulnerabilities/37256

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2007-5636), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.