The administrator password setting of the D-Link DIR-820L 1.06B02 is has Improper Access Control and is vulnerable to Unverified Password Change via crafted POST request to /get_set.ccp.
D-Link DIR-820L 1.05b03 was discovered to contain a remote code execution (RCE) vulnerability via the ping_addr parameter in the ping_v4 and ping_v6 functions.
A heap overflow vulnerability in D-Link DIR820LA1_FW106B02 allows attackers to cause a denial of service via the config.log_to_syslog and log_opt_dropPackets parameters to mydlink_api.ccp.
A stack overflow vulnerability in D-Link DIR820LA1_FW106B02 allows attackers to cause a denial of service via the reserveDHCP_HostName_1.1.1.0 parameter to lan.asp.