CVE-2021-34464

Name: CVE-2021-34464
Creator: NVD / NIST
Published: 2021-07-16T21:15:10.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 2.86%

Last modified Jun 17, 2026

CVE-2021-34464 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Microsoft Defender Remote Code Execution Vulnerability. EPSS estimates a 2.86% chance of exploitation in the next 30 days.

Description

Microsoft Defender Remote Code Execution Vulnerability

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

2.86%

84.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Malware Protection Engine	All versions

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34464Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34464Patch, Vendor Advisory

Timeline

Published: Jul 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34464?

Microsoft Defender Remote Code Execution Vulnerability

How severe is CVE-2021-34464?

CVE-2021-34464 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 2.86% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34464?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34464?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST