KEV Entry

CVE-2021-42321

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2021-42321

2021-11-17 00:00 UTC

Timestamps

2021-11-17

2021-11-17

Scope

KEVIntel entry: Microsoft Exchange Server Remote Code Execution Vulnerability | Affected: Microsoft / Microsoft Exchange Server 2016 Cumulative Update 21, Microsoft Exchange Server 2019 Cumulative Update 10, Microsoft Exchange Server 2016 Cumulative Update 22, Microsoft Exchange Server 2019 Cumulative Update 11 | CVSS: 8.8 (HIGH) | Used in malware: yes | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2021-42321', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-42321'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2021-42321'}

3fcddbd7-bfff-4e41-b452-04f1f9a934af

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 14:04 UTC

2026-06-23 14:04 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel confirmed_compromise 0.70
View details 
{
  "added_date": "2021-11-17T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 8.8,
  "cvss_severity": "HIGH",
  "epss_percentile": null,
  "epss_score": null,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "product": "Microsoft Exchange Server 2016 Cumulative Update 21, Microsoft Exchange Server 2019 Cumulative Update 10, Microsoft Exchange Server 2016 Cumulative Update 22, Microsoft Exchange Server 2019 Cumulative Update 11",
  "title": "Microsoft Exchange Server Remote Code Execution Vulnerability",
  "used_in_malware": "yes",
  "vendor": "Microsoft"
}
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