Published: 19 October 2010
Unspecified vulnerability in the Swing component in Oracle Java SE and Java for Business 6 Update 21, 5.0 Update 25, 1.4.2_27, and 1.3.1_28 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 unsafe reflection involving the UIDefault.ProxyLazyValue class.
From the Ubuntu security team
It was discovered that UIDefault.ProxyLazyValue had unsafe reflection usage, allowing an attacker to create objects.
red hat description: UIDefault.ProxyLazyValue had unsafe reflection usage, allowing untrusted callers to create objects via ProxyLazyValue values.