Netentsec NS-ASG Application Security Gateway JSON Content uploadiscuser.php sql injection

A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3. It has been declared as critical. This vulnerability affects unknown code of the file /protocol/iscuser/uploadiscuser.php of the component JSON Content Handler. The manipulation of the argument messagecontent leads to sql injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-266848. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.