Eudora 6.1 and 6.0.3 for Windows allows remote attackers to cause a denial of service (crash) via a deeply nested multipart MIME message.

Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code via an e-mail with (1) a link to a long URL to the C drive or (2) a long attachment name.

Eudora before 6.1.1 allows remote attackers to cause a denial of service (crash) via an e-mail with a long "To:" field, possibly due to a buffer overflow.

Buffer overflow in cram.dll in QUALCOMM Eudora WorldMail 3.0 allows remote attackers to execute arbitrary code via an IMAP APPEND command with a long message literal argument, as demonstrated by Worldmail.pl. NOTE: this is a different vector and a different manipulation than CVE-2005-4267, so it might be a different vulnerability than CVE-2005-4267.

Eudora 4.1 allows remote attackers to perform a denial of service by sending attachments with long file names.

Microsoft HTML control as used in (1) Internet Explorer 5.0, (2) FrontPage Express, (3) Outlook Express 5, and (4) Eudora, and possibly others, allows remote malicious web site or HTML emails to cause a denial of service (100% CPU consumption) via large HTML form fields such as text inputs in a table cell.

Eudora and Eudora Light before 3.05 allows remote attackers to cause a crash and corrupt the user's mailbox via an e-mail message with certain dates, such as (1) dates before 1970, which cause a Divide By Zero error, or (2) dates that are 100 years after the current date, which causes a segmentation fault.

Eudora 4.x allows remote attackers to bypass the user warning for executable attachments such as .exe, .com, and .bat by using a .lnk file that refers to the attachment, aka "Stealth Attachment."

Buffer overflow in the IMAPd service in Qualcomm Eudora WorldMail 9.0.333.0 allows remote attackers to execute arbitrary code via a long string in a UID command.