UnknownPublished 3 Mar 2026

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

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 2026-03-03

Impact

The primary impact is the exposure of Fortigate VPN devices to reconnaissance activities that could precede exploitation attempts of CVE-2023-27997. Successful exploitation would allow attackers to bypass authentication controls, potentially gaining unauthorized access to VPN infrastructure. This could compromise confidentiality, integrity, and availability of remote access services, enabling data breaches, lateral movement, and disruption of secure communications. Currently, no active exploitation is confirmed, so the immediate impact is low. However, failure to detect and mitigate reconnaissance could enable attackers to prepare for future attacks. The use of webcrawler user agents for scanning may complicate detection efforts, increasing the risk of unnoticed reconnaissance.

Defensive guidance

Organizations should implement advanced network monitoring and intrusion detection rules to identify repeated GET requests to /remote/logincheck and similar suspicious activity on Fortigate VPN devices. Apply rate limiting and IP reputation filtering to block or throttle traffic from known malicious IP addresses identified in the alerts. Segment VPN infrastructure to limit potential breach impact. Harden Fortigate VPN configurations by disabling unnecessary services and enforcing strong authentication such as multi-factor authentication. Continuously analyze VPN logs for anomalous access patterns and correlate with updated threat intelligence. Maintain communication with Fortinet support and monitor advisories for future patches or mitigations related to CVE-2023-27997. Deploy web application firewalls or reverse proxies in front of VPN portals to filter malicious HTTP requests. Train security teams to recognize reconnaissance patterns and improve incident response readiness. Integrate updated threat intelligence feeds for timely detection and response.

Indicators of compromise

IP addresses 5

2001:470:2cc:1:a6e8:f796:a067:1973ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
2001:470:1:fb5:7ea6:eff6:a807:145bET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
114.111.32.191ET SCAN Naver Webcrawler User-Agent (Naver.me)
211.249.46.86ET SCAN Naver Webcrawler User-Agent (Naver.me)
110.93.150.195ET SCAN Naver Webcrawler User-Agent (Naver.me)

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:27 UTC

Indicators of compromise

IP addresses 5

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