UnknownPublished 28 Feb 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-02-28

Affects tlp clearSource CIRCL OSINT Feed

TLP:CLEAR, disclosure is not limited

Mentions 1 CVE

Mentioned vulnerabilities

CVE-2023-27997

Description

KRVTZ-NET IDS alerts for 2026-02-28

Impact

If exploited, CVE-2023-27997 could allow attackers to bypass authentication on Fortigate VPN devices, granting unauthorized access to internal networks. This could lead to data breaches, lateral movement within networks, disruption of secure remote access services, and potential compromise of critical infrastructure. Although no active exploitation is currently observed, the reconnaissance activity indicates potential future exploitation attempts. The global deployment of Fortigate VPNs increases the likelihood of targeted attacks. The absence of patches complicates mitigation efforts, increasing reliance on detection and network-level defenses. Overall, the threat poses a moderate risk with potential for high impact if exploitation occurs.

Defensive guidance

Organizations should enhance monitoring of Fortigate VPN endpoints to detect unusual or repeated GET requests to /remote/logincheck. Deploy IDS/IPS solutions with updated signatures to identify related activity. Implement network segmentation to isolate VPN devices from sensitive internal resources. Enforce strict access controls and multi-factor authentication on VPN devices to reduce risk. Block or rate-limit suspicious IP addresses exhibiting scanning behavior, such as 2001:470:1:c84::14. Regularly review VPN logs for anomalous access patterns and conduct penetration testing to assess security posture. Consider deploying web application firewalls or reverse proxies to filter malicious requests targeting VPN portals. Maintain engagement with Fortinet support and monitor security advisories for any forthcoming patches or workarounds. Keep threat intelligence feeds updated to stay informed of evolving exploitation attempts.

Indicators of compromise

IP addresses 1

ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)

2001:470:1:c84::14

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:28 UTC

Indicators of compromise

IP addresses 1

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