UnknownPublished 28 Mar 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-03-28

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 2026-03-28

Impact

The impact is currently limited to reconnaissance activities aimed at identifying vulnerable Fortigate VPN devices. There are no reports of active exploitation or ransomware campaigns linked to this activity. If CVE-2023-27997 were successfully exploited, it could lead to unauthorized access to VPN infrastructure, compromising the confidentiality and integrity of remote access sessions and potentially allowing attackers to bypass authentication and gain network footholds. However, the low severity and absence of known exploits suggest limited immediate risk. Exposed Fortigate VPN endpoints remain at risk if patches or mitigations are delayed.

Defensive guidance

Organizations should implement strict access controls on Fortigate VPN management interfaces, restricting access to trusted IP addresses only. Enable and monitor detailed logging to detect anomalous login attempts targeting the /remote/logincheck endpoint. Deploy IDS/IPS solutions with updated signatures to identify and block reconnaissance and exploit attempts. Use multi-factor authentication for VPN access and segment VPN infrastructure from critical internal networks. Consider deploying web application firewalls or reverse proxies to filter malicious HTTP requests. Maintain updated threat intelligence feeds and conduct regular vulnerability assessments. Apply vendor security advisories promptly once patches or mitigations become available.

Indicators of compromise

IP addresses 2

43.157.46.118ET USER_AGENTS User-Agent (_TEST_)
2001:470:1:fb5::220ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:22 UTC

Indicators of compromise

IP addresses 2

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