The IMAP Client for Sylpheed 0.8.11 allows remote malicious IMAP servers to cause a denial of service (crash) via certain large literal size values that cause either integer signedness errors or integer overflow errors.

Microsoft Outlook 2002 does not properly handle requests to encrypt email messages with V1 Exchange Server Security certificates, which causes Outlook to send the email in plaintext, aka "Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure."

Outlook Express 6.0 does not delete messages from dbx files, even when a user empties the Deleted items folder, which allows local users to read other users email.

Microsoft Outlook 2002 allows remote attackers to execute arbitrary JavaScript code, even when scripting is disabled, via an "about:" or "javascript:" URI in the href attribute of an "a" tag.

Microsoft Outlook 2002 allows remote attackers to embed bypass the file download restrictions for attachments via an HTML email message that uses an IFRAME to reference malicious content.

Buffer overflow in Microsoft Outlook Express 5.0, 5.5, and 6.0 allows remote attackers to cause a denial of service (crash) via a long <A HREF> link.

Microsoft Outlook 2002 allows remote attackers to cause a denial of service (repeated failure) via an email message with a certain invalid header field that is accessed using POP3, IMAP, or WebDAV, aka "E-mail Header Processing Flaw Could Cause Outlook 2002 to Fail."

Buffer overflow in the S/MIME Parsing capability in Microsoft Outlook Express 5.5 and 6.0 allows remote attackers to execute arbitrary code via a digitally signed email with a long "From" address, which triggers the overflow when the user views or previews the message.

The (1) CertGetCertificateChain, (2) CertVerifyCertificateChainPolicy, and (3) WinVerifyTrust APIs within the CryptoAPI for Microsoft products including Microsoft Windows 98 through XP, Office for Mac, Internet Explorer for Mac, and Outlook Express for Mac, do not properly verify the Basic Constraints of intermediate CA-signed X.509 certificates, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack for SSL sessions, as originally reported for Internet Explorer and IIS.

The ASN1 library in OpenSSL 0.9.6d and earlier, and 0.9.7-beta2 and earlier, allows remote attackers to cause a denial of service via invalid encodings.