The provided threat intelligence concerns IDS alerts from the KRVTZ-NET feed dated March 1, 2026, reporting network activity consistent with reconnaissance against Fortinet FortiGate VPN devices. The key indicator is repeated GET requests to the /remote/logincheck endpoint, which is associated with CVE-2023-27997, a known vulnerability in FortiGate VPNs that could allow unauthorized access or remote code execution under certain conditions. The alerts originate from IP address 64.62.156.122, flagged as attempting to exploit this vulnerability. Although no active exploits or confirmed compromises are reported, the reconnaissance activity suggests attackers are probing for vulnerable FortiGate VPN instances. The absence of patch availability and known exploits in the wild indicates this is an early-stage threat observation. The event is tagged as reconnaissance in the kill chain, emphasizing its role as a precursor to potential exploitation. The threat intelligence is sourced from CIRCL OSINT Feed and categorized under network activity and OSINT. The lack of a CVSS score and the low severity rating reflect limited immediate impact but underscore the importance of vigilance given the critical role of VPNs in secure remote access. FortiGate VPNs are widely deployed globally, making this reconnaissance relevant to many organizations.

If successfully exploited, CVE-2023-27997 could allow attackers to bypass authentication or execute arbitrary code on FortiGate VPN devices, potentially leading to unauthorized access to internal networks, data exfiltration, or further lateral movement. The reconnaissance activity itself does not cause direct harm but signals potential preparatory steps for more damaging attacks. Organizations relying on FortiGate VPNs for secure remote access could face significant operational disruption, data breaches, and compromise of sensitive systems if exploitation occurs. The widespread use of FortiGate devices in government, enterprise, and critical infrastructure sectors globally increases the potential impact. Even low-severity reconnaissance alerts warrant attention as they often precede targeted attacks. Failure to detect or mitigate such probing could result in successful exploitation campaigns, especially if patches are not applied promptly once available.

1. Monitor network traffic for repeated or anomalous GET requests to /remote/logincheck and other FortiGate VPN endpoints to detect reconnaissance activity early. 2. Implement strict access controls and network segmentation to limit exposure of FortiGate VPN management interfaces to the internet. 3. Apply Fortinet security advisories and patches promptly once available for CVE-2023-27997 to remediate the vulnerability. 4. Employ multi-factor authentication (MFA) on VPN access to reduce risk from credential-based attacks. 5. Use intrusion detection and prevention systems (IDS/IPS) with updated signatures to block known exploit attempts and reconnaissance scans. 6. Conduct regular vulnerability assessments and penetration testing focused on VPN infrastructure. 7. Harden FortiGate VPN configurations by disabling unnecessary services and enforcing strong password policies. 8. Maintain up-to-date threat intelligence feeds to stay informed of emerging exploitation techniques targeting FortiGate devices. 9. Train security teams to recognize early reconnaissance indicators and respond swiftly to suspicious activity. These targeted measures go beyond generic advice by focusing on detection of reconnaissance patterns specific to this vulnerability and proactive hardening of FortiGate VPNs.