KEV Entry

CVE-2023-21529

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2023-21529

2026-06-01 13:07 UTC

Timestamps

2026-06-01

2026-06-01

Scope

KEVIntel entry: Microsoft Exchange Server Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft Exchange Server 2019 Cumulative Update 12, Microsoft Exchange Server 2019 Cumulative Update 11, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 23 | CVSS: 8.8 (HIGH) | EPSS: 0.62104 | Used in malware: yes | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2023-21529', 'url': 'https://www.cve.org/CVERecord?id=CVE-2023-21529'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2023-21529'}

02168ec5-91af-4771-b8dc-7daef32cd80b

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 14:03 UTC

2026-06-23 14:03 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel confirmed_compromise 0.70
View details 
{
  "added_date": "2026-06-01T13:07:10.012Z",
  "ahead_of_cisa_kev": {
    "count": 1,
    "unit": "day"
  },
  "cvss_score": 8.8,
  "cvss_severity": "HIGH",
  "epss_percentile": 0.99068,
  "epss_score": 0.62104,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "product": "Microsoft Exchange Server 2019 Cumulative Update 12, Microsoft Exchange Server 2019 Cumulative Update 11, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 23",
  "title": "Microsoft Exchange Server Remote Code Execution Vulnerability",
  "used_in_malware": "yes",
  "vendor": "Microsoft"
}
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