CVE-2020-12818: 
FortiOS vulnerability analysis and mitigation

An insufficient logging vulnerability was identified in FortiGate devices running versions before 6.4.1, tracked as CVE-2020-12818. The vulnerability was discovered and disclosed on September 24, 2020, affecting FortiGate firewall systems. This security issue could potentially allow traffic from unauthenticated attackers to Fortinet-owned IP addresses to go undetected (NVD, FortiGuard).

The vulnerability has been assigned a CVSS v3 score of 5.3, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), requiring no authentication (Au:N), and potentially impacting confidentiality partially (C:P) with no impact on integrity (I:N) or availability (A:N) (Rapid7).

The primary impact of this vulnerability is the potential for undetected network traffic to Fortinet-owned IP addresses. This logging insufficiency could allow malicious actors to conduct activities without being noticed in the system logs, potentially compromising the organization's security monitoring capabilities (NVD).

The vulnerability can be exploited by an unauthenticated attacker through network access. The low attack complexity suggests that exploitation is straightforward, though no specific instances of exploitation in the wild have been publicly documented (Rapid7).

The primary mitigation for this vulnerability is to upgrade FortiGate devices to version 6.4.1 or later. Fortinet has addressed the insufficient logging issue in this release (FortiGuard).