CVE-2007-1558: Undefined Security Weakness

The APOP protocol allows remote attackers to guess the first 3 characters of a password via man-in-the-middle MITM attacks that use crafted message IDs and MD5 collisions. NOTE: this design-level issue potentially affects all products that use APOP, including 1 Thunderbird 1.x before 1.5.0.12 and...