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CVE-2021-31943

26
FAUCET Score

CVE-2021-31943 is a Remote Code Execution (RCE) vulnerability affecting Microsoft 3D Viewer. This high-severity flaw, with a CVSS score of 7.8, allows an unauthenticated attacker to execute arbitrary code on a vulnerable system if a user is tricked into opening a malicious file. While no public exploit code or active exploitation is confirmed, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, < 7.2105.4012.0CPE match
cpe:2.3:a:microsoft:3d_viewer:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:3d_viewer:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 83rd percentile among its peer group of 11,617 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 3D ViewerFixed in: 7.2105.4012.0
View patch

Vendor Advisories (1)

microsoft2021-Jun/CVE-2021-31943Important

3D Viewer Remote Code Execution Vulnerability

Jun 8, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-31943
PatchVendor Advisory