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7.8

Microsoft Defender Allows Malicious Code to Run Remotely

CVE-2021-42298 · published 4 years ago
Summary

Microsoft Defender, a security software, has a vulnerability that allows hackers to execute malicious code on a computer remotely. This means that a hacker can gain control of a computer without the user's knowledge or consent. To protect your computer, update Microsoft Defender to the latest version as soon as possible.

What to do
  • Update microsoft microsoft malware protection engine to version 1.1.18700.3 or later.
  • Update microsoft malware_protection_engine to version 1.1.18700.3 or later.
Affected software
VendorProductAffected versions
microsoft microsoft malware protection engine < 1.1.18700.3
microsoft malware_protection_engine < 1.1.18700.3
cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*
Original advisory text
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
7.8 High
Exploitation
6% chance of attack within 30 days
Type
CWE-94Code Injection
Timeline
Published10 Nov 2021
Updated1 Nov 2026
First seen19 Aug 2026
Sources
CVE-2021-42298 · NVD
CVE-2021-42298 · MITRE
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