Logstash versions before 7.4.1 and 6.8.4 contain a denial of service flaw in the Logstash Beats input plugin. An unauthenticated user who is able to connect to the port the Logstash beats input could send a specially crafted network packet that would cause Logstash to stop responding.
[
{
"product": "Logstash",
"vendor": "Elastic",
"versions": [
{
"status": "affected",
"version": "before 7.4.1 and 6.8.4"
}
]
}
]