description: If a long user name is used in a username/password combination in a site URL (such as " http://UserName:Password@example.com"), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service. This vulnerability affects Firefox < 55.
problem types: DOS attack through long username in URL
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 55, status: affected, version: unspecified, versionType: custom
}