On Swann DVR04B, DVR08B, DVR-16CIF, and DVR16B devices, raysharpdvr application has a vulnerable call to โsystemโ, which allows remote attackers to execute arbitrary code via TCP port 9000.
On Swann DVR04B,
Exploit
CVE-2013-7487
NVD
Refer to CVE-2013-7487 NVD advisory