CVE-2024-20671

Local antimalware startup prevention

Published Mar 12, 2024 · Updated May 3, 2025

Security feature bypass in Microsoft Defender Antivirus Antimalware Platform before 4.18.24010.12 allows local users to prevent startup. Microsoft has not disclosed the component or incorrect operation that lets a low-privileged process block the antimalware platform from starting. Successful exploitation requires local low-privilege access and interrupts Defender protection without affecting data confidentiality or integrity.

CVSS severity5.5
Medium
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Security feature bypass in Microsoft Defender Antivirus Antimalware Platform before 4.18.24010.12 allows local users to prevent startup. Microsoft has not disclosed the component or incorrect operation that lets a low-privileged process block the antimalware platform from starting. Successful exploitation requires local low-privilege access and interrupts Defender protection without affecting data confidentiality or integrity.

The record

CVE
CVE-2024-20671
Published
Mar 12, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Microsoft Defender Antivirus Antimalware Platform
Classifications
CWE-276, T1562.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0.0 <4.18.24010.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Defender Antivirus Antimalware Platformversion=4.0.0.0 <4.18.24010.12

Published CVSS scores

5.5Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1562.001Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo