The KRVTZ-NET IDS alerts dated 2026-02-27 report network activity indicative of reconnaissance targeting two notable vulnerabilities: CVE-2025-55182 affecting React Server Components and CVE-2023-27997 impacting Fortigate VPN devices. The React vulnerability involves unsafe Flight Protocol property access in React2Shell, which could allow attackers to execute unauthorized commands or access sensitive data if exploited. However, no patch is currently available for this vulnerability. The Fortigate VPN vulnerability involves repeated GET requests to the /remote/logincheck endpoint, which is known to be exploited to bypass authentication or cause denial of service. The alerts include IP addresses 172.94.9.249 (React2Shell exploit attempts) and 65.49.20.68 and 2001:470:1:c84::23 (Fortigate VPN exploit attempts). These indicators suggest automated scanning or probing activity consistent with the reconnaissance phase of an attack kill chain. No confirmed exploits in the wild or ransomware campaigns have been linked to these alerts. The data originates from the CIRCL OSINT feed and is tagged as low severity with no CVSS score assigned. The lack of patches for the React vulnerability and ongoing exploitation attempts against Fortigate VPN highlight the need for vigilance. The reconnaissance nature means attackers are likely gathering information to identify vulnerable targets for future exploitation.

If successfully exploited, the React Server Components vulnerability (CVE-2025-55182) could allow attackers to execute arbitrary code or access sensitive application data, compromising confidentiality and integrity. The Fortigate VPN vulnerability (CVE-2023-27997) could enable unauthorized access to VPN services, potentially leading to network infiltration, data exfiltration, or disruption of remote access capabilities. Although current activity is reconnaissance, these vulnerabilities pose a risk of privilege escalation and lateral movement within targeted networks. Organizations relying on Fortigate VPN appliances and React Server Components face increased risk of targeted attacks, especially if patches or mitigations are not applied promptly. The reconnaissance activity may precede more severe exploitation attempts, increasing the threat landscape for affected entities. The impact is heightened for organizations with remote workforces or public-facing React applications, as attackers may leverage these vectors to gain initial access or disrupt services.

Organizations should immediately ensure that all Fortigate VPN devices are updated with the latest security patches addressing CVE-2023-27997. Network administrators should monitor VPN login endpoints for abnormal repeated GET requests and implement rate limiting or web application firewall (WAF) rules to block suspicious traffic. For React Server Components, although no patch is currently available for CVE-2025-55182, developers should review application code for unsafe Flight Protocol property access patterns and apply strict input validation and access controls. Deploying network intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect these specific exploit attempts is recommended. Additionally, organizations should conduct regular threat hunting and log analysis to identify reconnaissance activity early. Segmentation of critical systems and limiting exposure of VPN and React services to the internet can reduce attack surface. Finally, maintaining an incident response plan that includes procedures for handling reconnaissance and exploitation attempts will improve readiness.