<164>Aug 15 2023 14:27:37: %ASA-4-106023: Deny icmp src dmz-1:66.206.138.156 dst outside:237.243.45.215 (type 3, code 3) by access-group "dmz_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:
action: block
facilitycode: 20
facilitylabel: local4
messagetype: firewall_action
priority: 164
protocol: 1
senderhost: 10.0.0.1
sensitivity: normal
severitycode: 4
severitylabel: warning
sourceinfo: unknown
tags: ['cisco_asa_deny', 'deny', 'cisco_asa', 'firewall_action']
vendorcode: ASA-4-106023
streamName: cisco_asa
clientIP: 66.206.138.156
serverIP: 237.243.45.215