The application does not validate the presence of required appearance (AP) data before accessing stamp annotation resources. When a PDF contains a stamp annotation missing its AP entry, the code continues to dereference the associated object without a prior null or validity check, which allows a crafted document to trigger a null pointer dereference and crash the application, resulting in denial of service.

Foxit Reader versions through 5.4.5.0114, including the bundled Foxit Reader Plugin 2.2.1.530, contains a stack-based buffer overflow vulnerability in the npFoxitReaderPlugin.dll module. When a PDF file is loaded from a remote host, an overly long query string in the URL can overflow a buffer, allowing remote attackers to execute arbitrary code.

Foxit Reader 2.2 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a PDF file with (1) a malformed ExtGState resource containing a /Font resource, or (2) an XObject resource with a Rotate setting, which triggers memory corruption. NOTE: this is probably a different vulnerability than CVE-2007-2186.