Provide references for CVE-2021-4242.
Where can I find more information about CVE-2021-4242?
References are available at: https://blog.csdn.net/qq_44159028/article/details/114590267, https://github.com/smallpiggy/Sapido--rce/blob/main/Sapido%E8%B7%AF%E7%94%B1%E5%99%A8-rce.py, https://vuldb.com/?id.214592.