Paul Szabo has reported a vulnerability in Eudora, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error within the URL handling functionality. This can be exploited via a malicious email containing a specially crafted overly long link (about 300 bytes).

Successful exploitation allows execution of arbitrary code on a vulnerable system, but requires that the user is tricked into clicking the malicious URL.

The vulnerability has been reported in versions 6.1 and prior for Windows. Other versions may also be affected.

Solution
Qualcomm has released version 6.1.1 which reportedly fixes the URL handling vulnerability:
Further details available to Secunia VIM customers

Provided and/or discovered by
Paul Szabo

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://www.maths.usyd.edu.au/u/psz/securepc.html#Eudoraxx

http://www.eudora.com/download/eudora/windows/6.1.1/RelNotes.txt

Deep Links
Links available to Secunia VIM customers