UnknownPublished 21 Mar 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-03-21

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 2026-03-21

Impact

The immediate impact is low as the activity is primarily reconnaissance and scanning. However, brute force attempts against submission services could lead to unauthorized access if weak credentials are present. Exploit attempts targeting Fortigate VPN devices could allow attackers to bypass authentication and gain unauthorized access, risking exposure of internal networks and sensitive data. Requests to hidden environment files may reveal secrets if improperly secured, facilitating further compromise. No active exploitation or ransomware campaigns are confirmed at this time.

Defensive guidance

Organizations should ensure Fortigate VPN devices are updated with the latest security patches addressing CVE-2023-27997. Implement strong authentication controls on submission services, including rate limiting, account lockout, and multi-factor authentication to mitigate brute force attempts. Restrict access to hidden environment files by configuring web servers and applications to deny such requests and audit for exposed secrets regularly. Monitor VPN and submission service logs for unusual access patterns and repeated failed login attempts. Deploy intrusion detection and prevention systems with updated signatures to detect and block known exploit attempts. Network segmentation and threat intelligence sharing can enhance detection and response capabilities.

Indicators of compromise

IP addresses 7

172.245.195.56haproxy: 172.245.195.56 connecting to (submission/TCP) 15x in hour, possible bruteforcing.
2001:470:2cc:1:868e:f01b:ee87:8e35ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
172.71.164.219ET INFO Request to Hidden Environment File - Inbound
172.71.164.224ET INFO Request to Hidden Environment File - Inbound
172.71.164.213ET INFO Request to Hidden Environment File - Inbound
172.71.164.65ET INFO Request to Hidden Environment File - Inbound
172.71.164.64ET INFO Request to Hidden Environment File - Inbound

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:24 UTC

Indicators of compromise

IP addresses 7

Community reviews

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