Outlook Express 5.5 and 6.0 on Windows treats a carriage return (CR) in a message header as if it were a valid carriage return/line feed combination (CR/LF), which could allow remote attackers to bypass virus protection and or other filtering mechanisms via a mail message with headers that only contain the CR, which causes Outlook to create separate headers.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Outlook_express | Microsoft | 5.5 (including) | 5.5 (including) |
| Outlook_express | Microsoft | 6.0 (including) | 6.0 (including) |