A request for one more firewall rule is a useful moment to examine the policy around it. The risk may not be the new rule itself. It may be an earlier broad rule, missing security profiles, incomplete logging, or an object whose name no longer describes its members.
Start with rule order and intent
Read the policy from the top in the same order the firewall evaluates it. For each relevant rule, compare the name and description with source, destination, user, application, service, and action. A precise name cannot compensate for broad matching criteria.
Use observed applications carefully
Review application usage over a representative period before narrowing a rule. Identify incomplete sessions and dependencies that may not appear during a short sample. Where policy uses application-default, confirm that exceptions are documented rather than hidden in an overly broad service definition.
Check inspection and logging as part of access
An allow rule without the intended security profiles can create a gap even when its addresses and applications are correct. Review the attached profile group, log-at-session-end behaviour, log forwarding, and any decryption assumptions that affect inspection.
Look for shadowing and stale access
Identify rules that never match, rules hidden by earlier entries, expired temporary access, and disabled rules that should be removed after the retention period. Confirm object groups against their actual members. Cleanup should follow the same change and rollback discipline as new access.
Make the review repeatable
Record findings as evidence: rule UUID, current match criteria, observed use, owner, recommended change, validation, and rollback. A repeatable review turns policy maintenance into an operating process rather than an occasional emergency cleanup.