AI agents call pfsense_list_vpn_openvpn_servers to retrieve information from Pfsense without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'list' verb indicates a retrieval operation. However, severity is medium rather than low because VPN server configurations can include sensitive information (IP addresses, ports, encryption parameters, certificate details) that could be valuable to an attacker for reconnaissance or bypass attempts, even though the tool itself performs no destructive or modifying actions.
From the tool's definition Tool name includes 'list' and 'vpn_openvpn_servers', indicating it retrieves/queries VPN server configuration data without modification. Description is empty, but the naming pattern is consistent with read-only operations on this MCP server.
Attacks that exploit this kind of access
pfsense_list_vpn_openvpn_servers. It is categorised as a Read tool in the Pfsense MCP Server, which means it retrieves data without modifying state.
Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_list_vpn_openvpn_servers: 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 Pfsense. Nothing to install.
pfsense_list_vpn_openvpn_servers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the pfsense_list_vpn_openvpn_servers 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 pfsense_list_vpn_openvpn_servers. 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.
pfsense_list_vpn_openvpn_servers is provided by the Pfsense MCP server (abl030/pfsense-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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