The host is installed with Mozilla Firefox before 45.0, Firefox ESR 38.x before 38.7 or Mozilla Thunderbird 38.x before 38.7 and is prone to a denial of service vulnerability. A flaw is present in the nsCSPContext::SendReports function in dom/security/nsCSPContext.cpp in Mozilla Firefox, which fails to prevent use of a non-HTTP report-uri for a Content Security Policy (CSP) violation report. Successful exploitation allows remote attackers to cause a denial of service (data overwrite) or possibly gain privileges by specifying a URL of a local file.