CVE-2025-21333

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2025-21333

Confirmed

Yes

2025-01-14 00:00 UTC

Timestamps

2025-01-14

2025-01-14

Scope

KEV entry: Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow vulnerability that allows a local attacker to gain SYSTEM privileges. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2025-02-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21333

References
  • {'id': 'CVE-2025-21333', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-21333'}

83bde85b-6aa7-4d61-b6dd-21e47485c88a

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 13:24 UTC

2026-02-06 07:53 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-122"
  ],
  "date_added": "2025-01-14",
  "due_date": "2025-02-04",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Windows",
  "vendorProject": "Microsoft",
  "vulnerabilityName": "Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability"
}
 -
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