Cross-site scripting (XSS) vulnerability in the SIP implementation on the Cisco SPA8000 and SPA8800 before 6.1.11, SPA2102 and SPA3102 before 5.2.13, and SPA 500 series IP phones before 7.4.9 allows remote attackers to inject arbitrary web script or HTML via the FROM field of an INVITE message, aka Bug IDs CSCtr27277, CSCtr27256, CSCtr27274, and CSCtr14715.