CVE-2007-5636

critical

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."

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/37256

https://euvd.enisa.europa.eu/vulnerability/EUVD-2007-5608

http://www.vupen.com/english/advisories/2007/3540

http://www.securityfocus.com/bid/26118

http://www.securityfocus.com/archive/1/482476/100/0/threaded

http://www.csnc.ch/static/advisory/csnc/nortel_UNIStim_IP_softphone_buffer-overflow_v1.0.txt

http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=655203

http://securityreason.com/securityalert/3271

http://secunia.com/advisories/27252

http://osvdb.org/38521

Details

Source: Mitre, NVD

Published: 2007-10-23

Updated: 2026-06-16

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.06685