<164>Feb 10 2023 03:28:10: %ASA-4-106023: Deny udp src outside:57.186.181.7/54622 dst dmz-1:227.0.57.135/3478 by access-group "outside_access_in" [0x0, 0x0]

This is a syslog message from a product called ASA Firewall by Cisco. The following fields were extracted from the message:
priority: 164
senderhost: 10.0.0.1
serverport: 3478
severitylabel: warning
tags: ['cisco_asa_deny', 'deny', 'cisco_asa', 'firewall_action']
productids: [17, 0]
severitycode: 4
sourceinfo: unknown
sensitivity: normal
facilitylabel: local4
messagetype: firewall_action
clientport: 54622
vendorcode: ASA-4-106023
action: block
protocol: 17
facilitycode: 20
streamName: cisco_asa
clientIP: 57.186.181.7
serverIP: 227.0.57.135