CVE-2021-28464

FAUCET Score

CVE-2021-28464 is a Remote Code Execution vulnerability affecting Microsoft VP9 Video Extensions. With a CVSS score of 7.8 (HIGH), it allows an unauthenticated attacker to execute arbitrary code on a vulnerable system if a user is tricked into opening a specially crafted file. While not currently listed in CISA's KEV catalog, there is no public exploit code available, and community discussion and media coverage are minimal, indicating low current exploitation activity.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:microsoft:vp9_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

2.25%

Probability of exploitation in next 30 days

EPSS Percentile

81.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0225 is in the 81st 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-Apr/CVE-2021-28464Important

VP9 Video Extensions Remote Code Execution Vulnerability

Apr 13, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-28464

PatchVendor Advisory