Microsoft Outlook Express before 4.72.3612.1700 allows a malicious user to send a message that contains a .., which can inadvertently cause Outlook to re-enter POP3 command mode and cause the POP3 session to hang.
http://marc.info/?l=bugtraq&m=92663402004275&w=2
http://marc.info/?l=bugtraq&m=92647407427342&w=2
Source: Mitre, NVD
Published: 1999-05-11
Updated: 2016-10-18
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High