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The FortiGate firewall must apply ingress filters to traffic that is inbound to the network through any active external interface.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-234152FNFG-FW-000115SV-234152r852962_ruleCCI-002403medium
Description
Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. Firewall filters control the flow of network traffic and ensure the flow of traffic is only allowed from authorized sources to authorized destinations. Networks with different levels of trust (e.g., the internet) must be kept separated.
STIGDate
Fortinet FortiGate Firewall Security Technical Implementation Guide2025-11-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-03Boundary Protection
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-002403
1.00

Details

Check Text (C-234152r852962_chk)

Log in to the FortiGate GUI with Super- or Firewall Policy-Admin privilege. 1. Click the Policy and Objects. 2. Click IPv4 or IPv6 Policy. 3. Verify the policies are configured for all Interfaces. 4. Verify the polices are configured with Action set either to DENY or ACCEPT based on the organizational requirement. If a Firewall Policy is not applied to all interfaces, this is a finding.

Fix Text (F-37302r611455_fix)

Log in to the FortiGate GUI with Super- or Firewall Policy-Admin privilege. 1. Click the Policy and Objects. 2. Click IPv4 or IPv6 Policy. 3. Click +Create New. 4. Name the policy, select Incoming and Outgoing Interfaces. 5. Create the policies with authorized sources and destinations. 6. Create the policies with Action set to either DENY or ACCEPT. 7. Ensure the Enable this policy is toggled to right. 8. Click OK. 9. Ensure a policy is created for each interface.