MSHTML.DLL HTML parser in Internet Explorer 4.0, and other versions, allows remote attackers to cause a denial of service (application crash) via a script that creates and deletes an object that is associated with the browser window object.

Microsoft Internet Explorer 6 allows remote attackers to cause a denial of service (crash) by accessing the object references of a FolderItem ActiveX object, which triggers a null dereference in the security check.

Microsoft Internet Explorer 6 allows remote attackers to cause a denial of service (stack overflow exception) via a DXImageTransform.Microsoft.Gradient ActiveX object with a long (1) StartColorStr or (2) EndColorStr property.

Internet Explorer 5.5 and earlier does not properly verify the domain of a frame within a browser window, which allows remote web site operators to read certain files on the client by sending information from a local frame to a frame in a different domain, aka a variant of the "Frame Domain Verification" vulnerability.

Cross-site scripting (XSS) vulnerability in Internet Explorer 5.01 and 6 in Microsoft Windows 2000 SP4 permits access to local "HTML-embedded resource files" in the Microsoft Management Console (MMC) library, which allows remote authenticated users to execute arbitrary commands, aka "MMC Redirect Cross-Site Scripting Vulnerability."

Microsoft Internet Explorer 5.01 and 6 allows certain script to persist across navigations between pages, which allows remote attackers to obtain the window location of visited web pages in other domains or zones, aka "Window Location Information Disclosure Vulnerability."

Microsoft Internet Explorer 6.0 and possibly others allows remote attackers to upload arbitrary file contents when users press a key corresponding to the JavaScript (1) event.ctrlKey or (2) event.shiftKey onkeydown event contained in a webpage. NOTE: it was reported that the vendor has disputed the severity of this issue.

Microsoft MSN Messenger 9.0 and Internet Explorer 6.0 allows remote attackers to cause a denial of service (crash) via an image with an ICC Profile with a large Tag Count.

Internet Explorer 5.0 does not properly reset the username/password cache for Web sites that do not use standard cache controls, which could allow users on the same system to access restricted web sites that were visited by other users.

By default, Internet Explorer 5.0 and other versions enables the "Navigate sub-frames across different domains" option, which allows frame spoofing.

Internet Explorer 4.0 and 5.0 allows a remote attacker to execute security scripts in a different security context using malicious URLs, a variant of the "cross frame" vulnerability.

Microsoft Internet Explorer 5.01 and 6 does not properly identify the originating domain zone when handling redirects, which allows remote attackers to read cross-domain web pages and possibly execute code via unspecified vectors involving a crafted web page, aka "Source Element Cross-Domain Vulnerability."

Microsoft Internet Explorer 5.01 and 6 does not properly handle uninitialized COM objects, which allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code, as demonstrated by the Nth function in the DirectAnimation.DATuple ActiveX control, aka "COM Object Instantiation Memory Corruption Vulnerability."

Internet Explorer 6.0 does not warn users when an expired certificate authority (CA) certificate is submitted to the user and a newer CA certificate is in the user's local repository, which could allow remote attackers to decrypt web sessions via a man-in-the-middle (MITM) attack.

Microsoft Internet Explorer 5.01 SP4 and 6 does not properly handle various HTML layout component combinations, which allows user-assisted remote attackers to execute arbitrary code via a crafted HTML file that leads to memory corruption, aka "HTML Rendering Memory Corruption Vulnerability."

Microsoft Internet Explorer 6 allows remote attackers to cause a denial of service (crash) by setting the Transition property on an uninitialized DXImageTransform.Microsoft.RevealTrans.1 ActiveX Object, which triggers a null dereference.

Cross-site scripting (XSS) vulnerability in ftp.htt in Internet Explorer 5.5 and 6.0, when running on Windows 2000 with "Enable folder view for FTP sites" and "Enable Web content in folders" selected, allows remote attackers to inject arbitrary web script or HTML via the hostname portion of an FTP URL.

HTML e-mail feature in Internet Explorer 5.5 and earlier allows attackers to execute attachments by setting an unusual MIME type for the attachment, which Internet Explorer does not process correctly.

Microsoft Internet Explorer 6 allows remote attackers to cause a denial of service (application crash) by accessing the URL property of a TriEditDocument.TriEditDocument object before it has been initialized, which triggers a NULL pointer dereference.

Microsoft Internet Explorer 7.0 Beta allows remote attackers to cause a denial of service (application crash) via a web page with multiple empty APPLET start tags. NOTE: a third party has disputed this issue, stating that the crash does not occur with Microsoft Internet Explorer 7.0 Beta3