<172>Feb 10 2023 00:31:46 10.52.255.1 : %PIX-4-106023: Deny tcp src outside:159.72.100.242/46854 dst inside:245.134.137.88/65001 by access-group "outside"

This is a syslog message from a product called PIX Firewall by Cisco. The following fields were extracted from the message:
priority: 172
senderhost: 10.52.255.1
serverport: 46854
severitylabel: warning
tags: ['cisco_pix_deny', 'deny', 'cisco_pix', 'firewall_action']
productids: [0]
severitycode: 4
sourceinfo: unknown
sensitivity: normal
facilitylabel: local5
messagetype: firewall_action
clientport: 65001
vendorcode: PIX-4-106023
action: block
protocol: 6
facilitycode: 21
streamName: cisco_pix
clientIP: 245.134.137.88
serverIP: 159.72.100.242