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CVE-2021-28465

25
FAUCET Score

CVE-2021-28465 is a Remote Code Execution vulnerability affecting Microsoft Web Media Extensions. With a CVSS score of 7.8 (High), this vulnerability allows an unauthenticated attacker to execute arbitrary code on a vulnerable system through user interaction, leading to high impact on confidentiality, integrity, and availability. While not actively exploited in the wild and lacking public exploit code, its inclusion in a Patch Tuesday update and moderate community discussion indicate its significance.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:web_media_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
3.66%
Probability of exploitation in next 30 days
EPSS Percentile
88.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0366 is in the 89th percentile among its peer group of 11,616 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: Web Media ExtensionsFixed in: 1.0.40831.0

Vendor Advisories (1)

microsoft2021-May/CVE-2021-28465Important

Web Media Extensions Remote Code Execution Vulnerability

May 11, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-28465
PatchVendor Advisory
zerodayinitiative.com / advisories/ZDI-21-572
Third Party Advisory
zerodayinitiative.com / advisories/ZDI-21-579
Third Party Advisory