STIGQter: STIG Summary: Fortinet FortiGate Firewall Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 05 Jan 2026:

The FortiGate firewall must be configured to restrict it from accepting outbound packets that contain an illegitimate address in the source address field via an egress filter or by enabling Unicast Reverse Path Forwarding (uRPF).

DISA Rule

SV-234157r611471_rule

Vulnerability Number

V-234157

Group Title

SRG-NET-000364-FW-000042

Rule Version

FNFG-FW-000145

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

This fix can be performed via the CLI of the FortiGate.

1. Open a CLI console via SSH or from the GUI.
2. Run the following commands:
# config system settings
# set asymroute disable
# set asymroute-icmp disable
# set asymroute6 disable
# set asymroute6-icmp disable
# end

Check Contents

The FortiGate has RPF enabled by default, but it can be disabled for IPv4, IPv4 ICMP, IPv6, and IPv6-ICMP with the "set asymroute enable" commands. Log in to the FortiGate CLI with Super-Admin privilege, and then run the command:
# get system settings | grep asymroute

Unless this device is intentionally setup for asymmetric routing, if any of the settings are set to "enable" this is a finding.

Vulnerability Number

V-234157

Documentable

False

Rule Version

FNFG-FW-000145

Severity Override Guidance

The FortiGate has RPF enabled by default, but it can be disabled for IPv4, IPv4 ICMP, IPv6, and IPv6-ICMP with the "set asymroute enable" commands. Log in to the FortiGate CLI with Super-Admin privilege, and then run the command:
# get system settings | grep asymroute

Unless this device is intentionally setup for asymmetric routing, if any of the settings are set to "enable" this is a finding.

Check Content Reference

M

Target Key

5258