UnknownPublished 11 Mar 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-03-11

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 2026-03-11

Impact

If exploited, CVE-2023-27997 could allow attackers to bypass authentication on Fortinet Fortigate VPN devices, potentially granting unauthorized access to internal networks. This could lead to data breaches, lateral movement within networks, and disruption of secure remote access services. The reconnaissance activity indicates an increased likelihood of exploitation attempts. Confidentiality and integrity of sensitive data could be compromised, and operational disruptions to VPN services may occur. The absence of an official patch complicates remediation. Sectors with high VPN usage, such as finance, healthcare, government, and critical infrastructure, face elevated risks. No known exploits in the wild have been confirmed to date.

Defensive guidance

Organizations should: 1) Restrict access to Fortigate VPN management interfaces by allowing connections only from trusted IP addresses and implementing strict network segmentation. 2) Deploy and fine-tune IDS/IPS solutions to detect and block repeated GET requests to /remote/logincheck. 3) Enable multi-factor authentication (MFA) for VPN access to mitigate authentication bypass risks. 4) Monitor VPN logs for unusual login patterns or repeated failed attempts. 5) Implement virtual patching using web application firewalls (WAF) or network firewalls to block known exploit patterns targeting the vulnerable endpoint. 6) Conduct regular threat hunting focused on Fortigate VPN traffic. 7) Engage with Fortinet support and subscribe to their security advisories for updates on patch releases or mitigation guidance. 8) Educate security teams about this vulnerability and detection strategies. 9) Deploy honeypots mimicking Fortigate VPN endpoints to detect attacker behavior. 10) Limit exposure of VPN endpoints to the public internet by placing VPN gateways behind additional security layers such as VPN concentrators or jump servers.

Indicators of compromise

IP addresses 1

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

2001:470:1:fb5::1a0

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:26 UTC

Indicators of compromise

IP addresses 1

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