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Name of the Vulnerable Software and Affected Versions: Netentsec NS-ASG Application Security Gateway version 6.3 Description: A critical issue has been found in the processing of the file /protocol/iscuser/deleteiscuser.php. The manipulation of the `messagecontent` argument leads to SQL injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond. Recommendations: For version 6.3, as a temporary workaround, consider restricting access to the /protocol/iscuser/deleteiscuser.php file until a patch is available. Avoid using the `messagecontent` argument in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this issue.