AI agents call pfsense_get_system_crl 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.
This tool retrieves Certificate Revocation List (CRL) data from the pfSense system. The GET HTTP method and the 'get' prefix in the tool name indicate a read-only operation that queries existing data with no side effects. While the context involves a firewall control system, this specific tool only fetches CRL information for inspection/monitoring purposes, making it a Read operation with low severity.
From the tool's definition Tool name 'pfsense_get_system_crl' uses 'get' verb and description 'GET /api/v2/system/crl' indicates an HTTP GET request, which retrieves data without modification.
Attacks that exploit this kind of access
GET /api/v2/system/crl. 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_get_system_crl: 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_get_system_crl 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_get_system_crl 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_get_system_crl. 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_get_system_crl 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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