BadBlue 2.5 allows remote attackers to cause a denial of service (refuse HTTP connections) via a large number of connections from the same IP address.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17064
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1721
http://www.securityfocus.com/bid/10983
http://www.gulftech.org/?node=research&article_id=00043-08202004