Ferritaas Incident Intelligence
Defect Intelligence Report Bug 0825101 Severity: High (Database Memory Footprint)

Full ISDB Database Load Forces Extreme Conserve Mode on Branch Firewalls

Loading the complete Internet Service Database (ISDB) onto entry-level branch appliances exhausts available system RAM, locking appliances into conserve mode under standard firewall policies. Switching to mini ISDB immediately reclaims 300MB+ RAM.

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⏱️ Est. Triage: 5–7 mins | Automated CLI Available

Technical Root Cause Analysis

The Internet Service Database (ISDB) provides pre-defined IP and port mappings for thousands of SaaS platforms and cloud providers. FortiOS compiles this dataset into a radix search tree inside memory to allow fast-path hardware matching in firewall policies and SD-WAN rules.

On appliances with 2GB or 4GB of physical RAM, the full ISDB database consumes over 450MB of volatile memory. When coupled with standard dynamic routing, logging, and inspection processes, this pushes baseline RAM usage past 88%. Fortinet introduced the mini database profile specifically to trim regional IP blocks while retaining core enterprise services.

Affected Firmware & Blast Radius Matrix

FortiOS Branch Vulnerable Builds Confirmed Clean Build Status & Workaround
FortiOS 7.0 7.0.0 – 7.0.11 7.0.12+ Switch to mini ISDB profile
FortiOS 7.2 7.2.0 – 7.2.3 7.2.4+ Mini ISDB available in system global
FortiOS 7.4 Default Tuned 7.4.x Branch Clean Auto-selects mini on 2GB hardware

Platform Impact: FG-40F, FG-60F, FG-61F, FG-70F, FG-80F, and virtual machines provisioned with 2GB–4GB vRAM.

Step 01: Free Verification CLI (Safe Read-Only)

Execute these commands to verify installed ISDB database version, global settings, and memory footprint:

Diagnostic Commands

# 1. Check installed Internet Service Database version and build
diagnose autoupdate versions | grep -A 4 "Internet Service"

# 2. Check memory consumption ranking
diagnose sys top-mem 15

# 3. Check current global ISDB configuration setting
show system global | grep internet-service

# 4. Confirm system memory performance status
get system performance status

Remediation & Workaround Steps (Teaser Preview)

Follow the complete non-disruptive ISDB tuning procedure in the Ferrite interactive suite:

Step 02: Switch Global Configuration to ISDB Mini Profile

Configure set internet-service-database mini to discard unnecessary regional cloud prefixes.

🔒 Interactive CLI Available in Ferrite Runbook #02

Step 03: Force Background Package Pruning

Trigger automated database consolidation to reclaim memory without dropping sessions.

🔒 Interactive CLI Available in Ferrite Runbook #02

Step 04: Verify SD-WAN & Firewall Policy Rule Integrity

Ensure critical cloud services (M365, AWS, Salesforce) continue steering seamlessly.

🔒 Interactive CLI Available in Ferrite Runbook #02
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Frequently Asked Questions

What causes Bug 0825101?

The full ISDB database creates an expansive memory trie structure in RAM that exceeds the available memory overhead on 2GB/4GB desktop units.

Does mini ISDB omit major cloud providers?

No. Mini ISDB maintains all top-tier business applications including Microsoft 365, AWS, Azure, Google Cloud, Salesforce, and Webex.

How much memory is recovered?

Switching from full to mini ISDB immediately returns 250MB to 350MB of physical RAM to the free pool.