ZoomEye finds 4.67 million hosts exposing mDNS on port 5353
A ZoomEye query for port 5353 returned 4,669,414 hosts responding to multicast DNS. The protocol requires no authentication and exposes device names, service lists and TXT records to any host on the same segment.
- ZoomEye: 4.67 million hosts answer on UDP port 5353
- mDNS reveals service lists, device names and TXT records without authentication
- Exposure comes from routing, VPN bridging and flat virtual switches
- Blocking 5353 at routed boundaries is recommended
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