DIR-822 Rev. B Firmware v2.02KRB09 and DIR-822-CA Rev. B Firmware v2.03WWb01 suffer from a LAN-Side Unauthenticated Remote Code Execution (RCE) vulnerability elevated from HNAP Stack-Based Buffer Overflow.
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).