A NULL pointer dereference in the SetWLanRadioSettings function of D-Link DIR-823G A1 v1.0.2B05 allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
https://www.dlink.com/en/security-bulletin/
https://github.com/z472421519/BinaryAudit/blob/main/PoC/NPD/DIR823G/SetWLanRadioSetting.md