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The FortiGate firewall must fail to a secure state if the firewall filtering functions fail unexpectedly.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-234148FNFG-FW-000090SV-234148r611444_ruleCCI-001190medium
Description
Firewalls that fail suddenly and with no incorporated failure state planning may leave the hosting system available but with a reduced security protection. Failure to a known safe state helps prevent systems from failing to a state that may cause unauthorized access to make changes to the firewall filtering functions. This applies to the configuration of the gateway or network traffic security function of the device. Abort refers to stopping the firewall filtering function before it has finished naturally. The term abort refers to both requested and unexpected terminations.
STIGDate
Fortinet FortiGate Firewall Security Technical Implementation Guide2025-11-19

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (9) 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.

BCD-01Business Continuity Management System (BCMS)
1.00
CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
DCH-01Data Protection
1.00
IAC-21Least Privilege
1.00
SEA-01Secure Engineering Principles
1.00
SEA-01.2Achieving Resilience Requirements
1.00
SEA-02Alignment With Enterprise Architecture
1.00
SEA-07.2Fail Secure
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (7) 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.

AU-3(2)Centralized Management of Planned Audit Record Content
1.00
AU-5Response to Audit Logging Process Failures
1.00
SC-24Fail in Known State
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(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-001190
1.00
NIST CSF 2.00 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.

PR.DS-10
1.00
PR.IR-03
1.00

Who does this work

13 NICE work roles and 8 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-234148r611444_chk)

Log in to the FortiGate GUI with Super-Admin privilege. 1. Open a CLI console, via SSH or available from the GUI. 2. Run the following command: # show ips global | grep -i fail-open # show system global | grep -i failopen If ips fail-open is set to enable or av-failopen is not set to off or av-failopen-session is not set to disable, this is a finding.

Fix Text (F-37298r611443_fix)

FortiGate will inherently fail closed upon a power failure. Additionally, the FortiOS kernel enters conserve mode when memory use reaches the red threshold (default 88 percent memory use). When the red threshold is reached, FortiOS functions that react to conserve mode, such as the antivirus transparent proxy, apply conserve mode based on configured conserve mode settings. Additionally, FortiOS generates conserve mode log messages and SNMP traps, and a conserve mode banner appears on the GUI. If memory use reaches the extreme threshold (95 percent memory used), new sessions are dropped and red threshold conserve mode actions continue. Conserve mode actions for filtering are configured as follows: Log in to the FortiGate GUI with Super-Admin privilege. 1. Open a CLI console, via SSH or available from the GUI. 2. Run the following command: # config ips global # set fail-open disable # end # config system global # set av-failopen off # set av-failopen-session disable # end