How severe is CVE-2021-43209?

CVE-2021-43209 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43209?

CVE-2021-43209 affects Microsoft 3d Viewer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43209?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-43209 published?

CVE-2021-43209 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2021-43209

CVE-2021-43209 is a high-severity vulnerability in Microsoft 3d Viewer with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft 3d Viewer
Published: 2021-11-10
Last modified: 2026-06-17

Description

3D Viewer Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2021-43209?: 3D Viewer Remote Code Execution Vulnerability
How severe is CVE-2021-43209?: CVE-2021-43209 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43209?: CVE-2021-43209 affects Microsoft 3d Viewer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-43209 published?: CVE-2021-43209 was published on 2021-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:3d_viewer:*:*:*:*:*:*:*:*

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