Cross-site scripting (XSS) vulnerability in the Linksys SPA941 VoIP Phone with firmware 5.1.8 allows remote attackers to inject arbitrary web script or HTML via the From header in a SIP message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/37022
http://secunia.com/advisories/27116
http://lists.grok.org.uk/pipermail/full-disclosure/2007-October/066430.html