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CVE-2021-27061

27
FAUCET Score

CVE-2021-27061 is a remote code execution vulnerability affecting Microsoft HEVC Video Extensions. With a CVSS score of 7.8 (High), it can be exploited locally with low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability if a user is tricked into opening a malicious file. While not currently listed in CISA's KEV catalog, there is no public exploit code available in Metasploit or ExploitDB, and community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:high_efficiency_video_coding:-:*:*:*:*:*:*:*

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
3.90%
Probability of exploitation in next 30 days
EPSS Percentile
89.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0390 is in the 90th 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-Mar/CVE-2021-27061Critical

HEVC Video Extensions Remote Code Execution Vulnerability

Mar 9, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-27061
PatchVendor Advisory