UnknownPublished 26 Feb 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-02-26

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 2026-02-26

Impact

If CVE-2023-27997 were exploited, attackers could bypass authentication on FortiGate VPN devices, potentially gaining unauthorized access to internal networks. This could lead to data breaches, lateral movement, and compromise of sensitive information. The reconnaissance activity increases the likelihood of exploitation if devices remain unpatched or misconfigured. Critical sectors relying on FortiGate VPNs for remote access could be at risk. However, no active exploitation or known exploits in the wild have been confirmed at this time, and the current impact is limited to scanning and information gathering.

Defensive guidance

Organizations should verify and apply any available patches for CVE-2023-27997 on FortiGate VPN devices. In the absence of patches, implement compensating controls such as multi-factor authentication for VPN access. Monitor VPN logs and IDS alerts for repeated or anomalous requests to /remote/logincheck and suspicious user-agent strings. Consider rate limiting, geo-blocking, or IP reputation filtering to reduce scanning attempts. Regular vulnerability assessments and penetration testing focused on VPN infrastructure are recommended. Subscribe to threat intelligence feeds for timely updates and update incident response plans to include FortiGate VPN exploitation scenarios.

Summary

This threat involves network reconnaissance detected by KRVTZ-NET IDS on February 26, 2026, targeting Fortinet FortiGate VPN devices. The reconnaissance consists of repeated GET requests to the /remote/logincheck endpoint, linked to CVE-2023-27997, a known vulnerability that could allow attackers to bypass authentication controls. The indicators include IPv6 addresses 2001:470:1:c84::19 and 2001:470:1:fb5:4709:6cd5:858c:48d, and IPv4 address 185.177.72.60, which show suspicious user-agent strings indicative of automated scanning tools. No patches or exploits in the wild are currently reported in this feed. The activity is categorized as reconnaissance in the cyber kill chain, signaling early-stage probing rather than active exploitation. The threat affects multiple countries globally and is rated low severity due to the absence of confirmed exploitation.

Indicators of compromise

IP addresses 3

2001:470:1:c84::19ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
2001:470:1:fb5:4709:6cd5:858c:48dET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
185.177.72.60ET HUNTING Suspicious User-Agent Observed (Mozilla/5.0 (Windows NT XX.X Win64 x64) AppleWebKit/XXX.XX)

Community reviews

Loading reviews…

Description

AI analysisMachine-generated, updated 10 May 2026, 02:29 UTC

Indicators of compromise

IP addresses 3

Community reviews

Related threats