CVE-2021-31947

FAUCET Score

CVE-2021-31947 is a Remote Code Execution vulnerability affecting Microsoft HEVC Video Extensions. With a CVSS score of 7.8 (HIGH), it allows an unauthenticated attacker to execute arbitrary code on a vulnerable system through user interaction, leading to high impact on confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, though it was addressed in Microsoft's July 2021 Patch Tuesday.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 1.0.41531.0CPE matchmatch criteria	cpe:2.3:a:microsoft:hevc_video_extensions::::::::

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

2.33%

Probability of exploitation in next 30 days

EPSS Percentile

81.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-28

Model: v2026.06.15

This CVE's current EPSS score of 0.0233 is in the 82nd percentile among its peer group of 11,621 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 (1)

microsoftpatch availablevia nvd_reference

View patch

Vendor Advisories (1)

microsoft2021-Jul/CVE-2021-31947Important

HEVC Video Extensions Remote Code Execution Vulnerability

Jul 13, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-31947

PatchVendor Advisory