CVE 2010-3573
Unspecified vulnerability in the Networking component in Oracle Java SE and Java for Business 6 Update 21 and 5.0 Update 25 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors. NOTE: the previous information was obtained from the October 2010 CPU. Oracle has not commented on claims from a reliable downstream vendor that this is related to missing validation of request headers in the HttpURLConnection class when they are set by applets, which allows remote attackers to bypass the intended security policy.
See the 
CVE page on Mitre.org
for more details.
