JRun 4.0 does not properly generate and handle the JSESSIONID, which allows remote attackers to perform a session fixation attack and hijack a user's HTTP session.

Cross-site scripting (XSS) vulnerability in the Management Console in JRun 4.0 allows remote attackers to execute arbitrary web script or HTML and possibly hijack a user's session.

Buffer overflow in the WriteToLog function for JRun 3.0 through 4.0 web server connectors, such as (1) mod_jrun and (2) mod_jrun20 for Apache, with verbose logging enabled, allows remote attackers to execute arbitrary code via a long HTTP header Content-Type field or other fields.

The Microsoft IIS Connector in JRun 4.0 and Macromedia ColdFusion MX 6.0, 6.1, and 6.1 J2EE allows remote attackers to bypass authentication and view source files, such as .asp, .pl, and .php files, via an HTTP request that ends in ";.cfm".

Unknown "file disclosure" vulnerability in Macromedia JRun 3.0, 3.1, and 4.0, related to a log file or jrun.ini, with unknown impact.

Macromedia JRun 3.0, 3.1, and 4.0 allow remote attackers to view the source code of .JSP files via Unicode encoded character values in a URL.

Macromedia JRun 3.0 through 4.0, when running on Windows, allows remote attackers to retrieve files in the WEB-INF directory, which contains Java class files and configuration information, via a request to the WEB-INF directory with a trailing dot ("WEB-INF.").

JRun 3.0 through 4.0 allows remote attackers to read JSP source code via an encoded null byte in an HTTP GET request, which causes the server to send the .JSP file unparsed.

The Java Server Pages (JSP) engine in JRun allows web page owners to cause a denial of service (engine crash) on the web server via a JSP page that calls WPrinterJob().pageSetup(null,null).

Buffer overflow in the ISAPI DLL filter for Macromedia JRun 3.1 allows remote attackers to execute arbitrary code via a direct request to the filter with a long HTTP host header field in a URL for a .jsp file.