replace-route-table-association

THE RISK

Medium Risk

Why replace-route-table-association needs a policy

This tool modifies network routing configuration by replacing route table associations, which is a reversible write operation. However, misuse can severely impact network connectivity for entire subnets or gateways, potentially disrupting production infrastructure across VPCs — hence high severity.

From the tool's definition Replace the route table association for a subnet or internet gateway or virtual private gateway

Documented attack patterns abuse exactly the kind of access replace-route-table-association gives an agent:

POLICY

How to control replace-route-table-association

PolicyLayer is an MCP gateway — it sits between your AI agents and AWS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for replace-route-table-association:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "replace-route-table-association": {
      "limits": [
        {
          "counter": "replace-route-table-association_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

replace-route-table-association 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.

Create a free account and register AWS 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.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about replace-route-table-association

What does the replace-route-table-association tool do? +

Replace the route table association for a subnet or internet gateway or virtual private gateway. It is categorised as a Write tool in the AWS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on replace-route-table-association? +

Register the AWS MCP Server MCP server in PolicyLayer and add a rule for replace-route-table-association: 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 AWS MCP Server. Nothing to install.

What risk level is replace-route-table-association? +

replace-route-table-association is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit replace-route-table-association? +

Yes. Add a rate_limit block to the replace-route-table-association 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 replace-route-table-association completely? +

Set action: deny in the PolicyLayer policy for replace-route-table-association. 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 replace-route-table-association? +

replace-route-table-association is provided by the AWS MCP Server MCP server (lokeswaran-aj/aws-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AWS MCP Server tool call.

Start from AWS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →