Kernel/System/EmailParser.pm in PostmasterPOP3.pl in Open Ticket Request System (OTRS) before 2.2.7 does not properly handle e-mail messages containing malformed UTF-8 characters, which allows remote attackers to cause a denial of service (e-mail retrieval outage) via a crafted message.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.