CVE-2021-42321

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2021-42321

Confirmed

Yes

2021-11-17 00:00 UTC

Timestamps

2021-11-17

2021-11-17

Scope

KEV entry: Microsoft Exchange Server Remote Code Execution Vulnerability | Affected: Microsoft / Exchange | Description: An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2021-12-01 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-42321

References
  • {'id': 'CVE-2021-42321', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-42321'}

043df6f6-a167-4beb-a3a9-0f81632bf69a

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 12:28 UTC

2026-02-06 07:17 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-184",
    "CWE-502"
  ],
  "date_added": "2021-11-17",
  "due_date": "2021-12-01",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Known",
  "product": "Exchange",
  "vendorProject": "Microsoft",
  "vulnerabilityName": "Microsoft Exchange Server Remote Code Execution Vulnerability"
}
 -
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