An Any/Any/Any rule can make a firewall look busy while providing very little real control. It allows any source to reach any destination using any service within the policy path.
These rules are often created during troubleshooting, migration, or emergency work. The immediate problem may be fixed, but the temporary rule remains and quietly becomes part of the permanent security posture.
Why these rules are risky
- They increase the number of systems and services an attacker may reach.
- They weaken segmentation between users, servers, applications, and sensitive zones.
- They make logs less useful because the policy does not describe the expected traffic.
- They can hide more specific rules placed below them.
- They are difficult to remove safely when the original business reason is undocumented.
Do not replace one broad rule with another
Safe remediation starts by learning what traffic is actually required. Use logs, application information, owner input, and change records to define the smallest practical scope.
- Restrict the source network or user group.
- Restrict the destination to the real service endpoints.
- Allow only the required ports and protocols.
- Apply suitable security profiles and logging.
- Add an owner, purpose, ticket reference, and review date.
Where the traffic cannot be narrowed immediately, treat the rule as an exception. Document it, monitor it, and give it a clear review date rather than allowing it to become invisible.
Next step: run a configsentry audit and use the findings to locate unrestricted or oversized policies before they are missed in a manual review.