CVE-2020-1284Network attack vector

Service interruption via mishandled SMBv3 requests

Published Jun 9, 2020 · Updated Aug 4, 2024

Denial of service in Microsoft Windows 10 and Windows Server version 2004 allows remote attackers to interrupt service through SMBv3 requests. Microsoft discloses only that SMBv3 3.1.1 client or server processing mishandles certain requests; the request form and code locus remain undisclosed. Exploitation requires user interaction despite network reachability, and Microsoft has not specified the exact failure mode or persistence.

CVSS severity6.5
Medium
EPSS probability6.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Microsoft Windows 10 and Windows Server version 2004 allows remote attackers to interrupt service through SMBv3 requests. Microsoft discloses only that SMBv3 3.1.1 client or server processing mishandles certain requests; the request form and code locus remain undisclosed. Exploitation requires user interaction despite network reachability, and Microsoft has not specified the exact failure mode or persistence.

The record

CVE
CVE-2020-1284
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Windows 10 Version 2004
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 2004version=unspecified
Microsoft · Windows Server, version 2004 (Server Core installation)version=unspecified

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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.

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No observations available

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

Weakness, pattern, technique

No sourced classifications are available.

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

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Your stack

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