Caucho Quercus, as distributed in Resin before 4.0.29, does not properly implement the == (equals sign equals sign) operator for comparisons, which has unspecified impact and context-dependent attack vectors.

Caucho Quercus, as distributed in Resin before 4.0.29, allows remote attackers to bypass intended restrictions on filename extensions for created files via a %00 sequence in a pathname within an HTTP request.

Caucho Technology Resin 2.1.12 allows remote attackers to gain sensitive information and view the contents of the /WEB-INF/ directory via an HTTP request for "WEB-INF..", which is equivalent to "WEB-INF" in Windows.