cli_fix_interface_blocking

THE RISK

High Risk

This tool runs CLI commands on a firewall to change interface blocking settings. It falls under Execute because it triggers external operations (CLI execution) that modify firewall behavior. The severity is high because misconfiguration of interface blocking on a firewall/DMZ can expose network segments to unauthorized traffic or disrupt security boundaries.

From the tool's definition 'Fix interface blocking settings via CLI' — executes CLI commands to modify firewall interface blocking configuration

Documented attack patterns abuse exactly the kind of access cli_fix_interface_blocking gives an agent:

HOW TO CONTROL CLI_FIX_INTERFACE_BLOCKING

PolicyLayer is an MCP gateway — it sits between your AI agents and OPNSense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cli_fix_interface_blocking:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cli_fix_interface_blocking": {
      "limits": [
        {
          "counter": "cli_fix_interface_blocking_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

cli_fix_interface_blocking stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register OPNSense MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More OPNSense MCP Server tools

Destructive acme_delete_action Delete an ACME automation action Destructive acme_revoke_certificate Revoke a certificate Destructive cert_delete Delete a certificate Destructive delete_firewall_rule Delete a firewall rule Destructive delete_vlan Delete a VLAN Destructive firewall_delete_rule Delete a firewall rule Destructive haproxy_acl_delete Delete an HAProxy ACL Destructive haproxy_action_delete Delete an HAProxy action

All 196 OPNSense MCP Server tools →

Execute tools on other servers

Frida Game Hacking MCP remove_breakpoint Procmon request_elevation WireMCP capture_packets Pentest Ai run_probe

Go deeper

High-risk tools in OPNSense MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the cli_fix_interface_blocking tool do? +

Fix interface blocking settings via CLI (for DMZ routing issues). It is categorised as a Execute tool in the OPNSense MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cli_fix_interface_blocking? +

Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for cli_fix_interface_blocking: 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 OPNSense MCP Server. Nothing to install.

What risk level is cli_fix_interface_blocking? +

cli_fix_interface_blocking is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cli_fix_interface_blocking? +

Yes. Add a rate_limit block to the cli_fix_interface_blocking 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.

How do I block cli_fix_interface_blocking completely? +

Set action: deny in the PolicyLayer policy for cli_fix_interface_blocking. 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.

What MCP server provides cli_fix_interface_blocking? +

cli_fix_interface_blocking is provided by the OPNSense MCP Server MCP server (vespo92/opnsensemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OPNSense MCP Server tool call.

Deterministic rules across all 196 OPNSense MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN OPNSENSE →

Free to start. No card required.

196 OPNSense MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT CLI_FIX_INTERFACE_BLOCKING ON OPNSENSE MCP SERVER DOES

// THE RISK

// HOW TO CONTROL CLI_FIX_INTERFACE_BLOCKING

// EXPLORE