FortiOS - RCE (CVE-2024-21762)

CVE-2024-21762 is an out-of-bounds write vulnerability affecting multiple versions of Fortinet FortiProxy and FortiOS. This flaw allows attackers to execute unauthorized code or commands on the affected systems by sending specially crafted requests, potentially leading to full system compromise or further attacks within the network.

CrowdSec has been tracking this vulnerability and its exploits since 1st of April 2025.

Based on data from the CrowdSec network, nearly all observed exploitation of CVE-2024-21762 is fully opportunistic, with attackers indiscriminately scanning the entire internet. These attacks are automated and lack any form of target selection or reconnaissance. In addition, according to the CrowdSec network, attack volume against CVE-2024-21762 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

Attackers exploit CVE-2024-23113 by sending specially crafted POST requests to the /remote/vulncheck endpoint on Fortinet FortiOS SSL VPN interfaces, attempting to trigger a heap buffer underflow vulnerability.