In Elasticsearch versions before 7.13.3 and 6.8.17 an uncontrolled recursion vulnerability that could lead to a denial of service attack was identified in the Elasticsearch Grok parser. A user with the ability to submit arbitrary queries to Elasticsearch could create a malicious Grok query that will crash the Elasticsearch node.
{ "severity": "Medium", "cpes": [ "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*" ] }