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FORENSIA

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Verdict

ACTIVELY EXPLOITED (CISA KEV)

What is this: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability Affects Microsoft Windows Server 2004.
Should you care: Yes — confirmed exploited in the wild (CISA Known Exploited Vulnerabilities). Linked to ransomware campaigns. CVSS 7.5 (high).
What to do: Patch now.

INVESTIGATEMODERATE EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Actively exploited with known ransomware use

CISA confirms this vulnerability has been exploited in the wild. CISA also records known ransomware campaign use. NVD rates the technical severity high at CVSS 7.5. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

CISA KEV · exploited in the wild

Added 2022-04-11.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

7.5 · high

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected surface

11 parsed products

Active Directory, Microsoft Windows Server 2004, Microsoft Windows Server 2008

Weakness class

Weakness not classified

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

3 connectors · 1573 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

4 findings

Confirmed exploitation in the wild

HIGH

Apply updates per vendor instructions.

CISA KEV · added 2022-04-11 · action due 2022-05-02

The CISA due date applies to U.S. federal civilian agencies; other organizations should use the action as authoritative remediation guidance, not a universal legal deadline.

Known ransomware campaign use

HIGH

CISA marks this vulnerability as used in known ransomware campaigns.

CISA KEV knownRansomwareCampaignUse = Known

The catalog field does not identify every actor, victim, or campaign using the vulnerability.

CVSS 7.5 high technical impact

HIGH

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Listed in the local CISA KEV catalog

Ready

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

Vulnerability intel

Local EPSS row, KEV flag, and catalog notes from stored metadata only.

CISA KEV2022-04-11

CVE: CVE-2021-42287
EPSS probability: not fetched / unavailable
EPSS fetched_at: 2026-08-11T10:44:17.711697Z

Added 2022-04-11Federal due date 2022-05-02Known ransomware use

Apply updates per vendor instructions.

The catalog due date governs U.S. federal civilian agencies; use the action as authoritative remediation guidance, not a universal legal deadline.

Affected products

Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).

Product	CPE (truncated)
Microsoft Windows Server 20h2	cpe:2.3:o:microsoft:windows_server_20h2::::::::
Microsoft Windows Server 2004	cpe:2.3:o:microsoft:windows_server_2004::::::::
Microsoft Windows Server 2022	cpe:2.3:o:microsoft:windows_server_2022::::::::
Microsoft Windows Server 2019	cpe:2.3:o:microsoft:windows_server_2019::::::::
Microsoft Windows Server 2016 2004	cpe:2.3:o:microsoft:windows_server_2016:2004:::::::*
Microsoft Windows Server 2016	cpe:2.3:o:microsoft:windows_server_2016::::::::
Microsoft Windows Server 2012 r2	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

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cve-2021-42287

Verdict

Actively exploited with known ransomware use

What the evidence supports

Confirmed exploitation in the wild

Known ransomware campaign use

CVSS 7.5 high technical impact

Evidence readiness

Vulnerability intel

Affected products

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11 affected product mappings