A stack-based buffer overflow vulnerability exists in Fortinet FortiOS versions 8.0.0 and 7.6.7. This flaw may allow an unauthenticated attacker with access to the wad port to crash proxy or ZTNA sessions by sending specially crafted HTTP or HTTPS requests. The vulnerability has a high severity rating with a CVSS score of 7.5 and impacts availability without affecting confidentiality or integrity.