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Microsoft-Windows-Security-Auditing › Event 4873

Event ID 4873 — A certificate request extension changed.

Provider
Microsoft-Windows-Security-Auditing
Channel
Security
Audit Policy
Object Access → Certification Services
Collection Priority
Recommended (NSA, others)
Opcode
Info

Description

A certificate request extension changed.

Message #

A certificate request extension changed.
	
Request ID: %1
Name: %2
Type: %3
Flags: %4
Data: %5

Fields #

NameDescription
RequestId UnicodeStringRequest ID
ExtensionName UnicodeStringName
ExtensionDataType UnicodeStringType
ExtensionPolicyFlags UnicodeStringFlags
ExtensionData UnicodeStringData
SubjectUserSid SID—
SubjectUserName UnicodeString—
SubjectDomainName UnicodeString—
SubjectLogonId HexInt64—
Request_ID—
Name—
Type—
Flags—
Data—

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Security-Auditing",
    "guid": "54849625-5478-4994-A5BA-3E3B0328C30D",
    "event_source_name": "",
    "event_id": 4873,
    "version": 0,
    "level": 0,
    "task": 12805,
    "opcode": 0,
    "keywords": 9232379236109516800,
    "time_created": "2026-03-13T23:33:40.140844+00:00",
    "event_record_id": 16717578,
    "correlation": {
      "ActivityID": "0D26E79C-B333-0001-07E8-260D33B3DC01"
    },
    "execution": {
      "process_id": 936,
      "thread_id": 13880
    },
    "channel": "Security",
    "computer": "LAB-DC01.ludus.domain",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "RequestId": "44",
    "ExtensionName": "2.5.29.17",
    "ExtensionDataType": "4",
    "ExtensionPolicyFlags": "0",
    "ExtensionData": "MwAwADIAMAA4ADIAMQAyADYAZAA2AGYANgA0ADYAOQA2ADYANgA5ADYANQA2ADQA\r\nMgBlADYAYwA3ADUANgA0ADcANQA3ADMAMgBlADYANAA2AGYANgBkADYAMQA2ADkA\r\nNgBlAAAA\r\n",
    "SubjectUserSid": "S-1-5-21-1006758700-2167138679-1475694448-1105",
    "SubjectUserName": "domainadmin",
    "SubjectDomainName": "ludus",
    "SubjectLogonId": "0xbefec"
  },
  "message": ""
}

References #