AI agents call pfsense_get_system_crl_revoked_certificate 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 information from the pfSense system. While it is a read operation with no direct destructive impact, the medium severity reflects that an AI agent could use this information to understand security posture, identify revoked certificates, and potentially inform decisions about trust relationships in the firewall infrastructure.
From the tool's definition GET /api/v2/system/crl/revoked_certificate — GET method indicates data retrieval with no side effects. Returns information about revoked certificates in the Certificate Revocation List.
Attacks that exploit this kind of access
GET /api/v2/system/crl/revoked_certificate. 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_revoked_certificate: 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_revoked_certificate 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_revoked_certificate 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_revoked_certificate. 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_revoked_certificate 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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