CVE-2021-31943

User-assisted arbitrary code execution

Published Jun 8, 2021 · Updated Aug 3, 2024

Remote code execution in Microsoft 3D Viewer before 7.2105.4012.0 allows attackers to execute code after user interaction. Microsoft has not published the affected component, input format, or unsafe operation that causes code execution. A local, unauthenticated attack still requires a user to open or otherwise process attacker-controlled content, and successful exploitation runs code in the application context.

CVSS severity7.8
High
EPSS probability2.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft 3D Viewer before 7.2105.4012.0 allows attackers to execute code after user interaction. Microsoft has not published the affected component, input format, or unsafe operation that causes code execution. A local, unauthenticated attack still requires a user to open or otherwise process attacker-controlled content, and successful exploitation runs code in the application context.

The record

CVE
CVE-2021-31943
Published
Jun 8, 2021
Updated
Aug 3, 2024
Vendor
Microsoft
Product
3D Viewer
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <7.2105.4012.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · 3D Viewerversion=7.0.0 <7.2105.4012.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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