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5.5

Microsoft Defender Denial of Service Vulnerability

CVE-2021-31978 · published 5 years ago
Summary

Microsoft Defender Denial of Service Vulnerability

What to do
  • Update microsoft malware_protection_engine to version 1.1.18200.3 or later.
Affected software
VendorProductAffected versions
microsoft malware_protection_engine < 1.1.18200.3
cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*
Original advisory text
Microsoft Defender Denial of Service Vulnerability
Microsoft Defender Denial of Service Vulnerability
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.5 Medium
Exploitation
1% chance of attack within 30 days
Timeline
Published8 Jun 2021
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-31978 · NVD
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