A stack-based buffer overflow [CWE-121] vulnerability in Fortinet FortiOS version 7.2.4 through 7.2.8 and version 7.4.0 through 7.4.4 allows a remote unauthenticated attacker to execute arbitrary code or commands via crafted UDP packets through the CAPWAP control, provided the attacker were able to evade FortiOS stack protections and provided the fabric service is running on the exposed interface.
Solution:
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).