Stack-based buffer overflow in the Persits.XUpload.2 ActiveX control in XUpload.ocx 3.0.0.4 and earlier in Persits XUpload 3.0 allows remote attackers to execute arbitrary code via a long argument to the AddFile method. NOTE: some of these details are obtained from third party information.
https://www.exploit-db.com/exploits/4987
https://exchange.xforce.ibmcloud.com/vulnerabilities/39967