AI agents use update_firewall_address to create or update resources in Fortimanager — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fortimanager environment.
The tool modifies firewall address objects within FortiManager, a critical network security appliance. While the operation is reversible (addresses can be updated again), it affects active security infrastructure and could disrupt network connectivity or security policies if misconfigured. Classified as Write rather than Execute because it updates data structures, not executes arbitrary code.
From the tool's definition Tool name 'update_firewall_address' indicates modification of firewall configuration. Description is empty, limiting direct evidence.
Documented attack patterns abuse exactly the kind of access update_firewall_address gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fortimanager, and nothing reaches the server without passing your rules. This is the rule we recommend for update_firewall_address:
{
"version": "1",
"default": "deny",
"tools": {
"update_firewall_address": {
"limits": [
{
"counter": "update_firewall_address_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_firewall_address stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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update_firewall_address. It is categorised as a Write tool in the Fortimanager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fortimanager MCP server in PolicyLayer and add a rule for update_firewall_address: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Fortimanager. Nothing to install.
update_firewall_address is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update_firewall_address rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for update_firewall_address. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
update_firewall_address is provided by the Fortimanager MCP server (jmpijll/fortimanager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fortimanager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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