FortiGate Overly Permissive Firewall Policy Created

Last updated 6 days ago on 2026-01-28

Created 6 days ago on 2026-01-28

About

This rule detects the creation or modification of a FortiGate firewall policy that permits all sources, all destinations, and all services. An overly permissive policy effectively bypasses all firewall protections. Threat actors exploiting CVE-2026-24858 have been observed creating such policies to allow unrestricted traffic flow through compromised FortiGate devices.

Tags

Use Case: Threat DetectionTactic: Defense EvasionDomain: NetworkData Source: FortinetData Source: Fortinet FortiGateLanguage: eql

Severity

high

Risk Score

MITRE ATT&CK™

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ Impair Defenses (T1562)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-fortinet_fortigate.*
Related Integrations: fortinet_fortigate(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗any where event.dataset == "fortinet_fortigate.log" and
    event.code == "0100044547" and
    fortinet.firewall.cfgpath == "firewall.policy" and
    fortinet.firewall.action in ("Add", "Edit") and
    fortinet.firewall.cfgattr like~ "*srcaddr[all]*" and
    fortinet.firewall.cfgattr like~ "*dstaddr[all]*" and
    fortinet.firewall.cfgattr like~ "*service[all]*"

Install detection rules in Elastic Security

Detect FortiGate Overly Permissive Firewall Policy Created in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).