CVE-2020-1061Network attack vector

User-context code execution via object memory corruption

Published May 21, 2020 · Updated Aug 19, 2026

Memory corruption in Microsoft Script Runtime on affected Windows releases allows remote attackers to execute code via crafted web content. The runtime mishandles objects in memory, but Microsoft has not disclosed the object type or the specific invalid memory operation. Exploitation requires user interaction with a crafted website, document, or embedded ActiveX control and grants the current user's rights.

CVSS severity7.5
High
EPSS probability3.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Microsoft Script Runtime on affected Windows releases allows remote attackers to execute code via crafted web content. The runtime mishandles objects in memory, but Microsoft has not disclosed the object type or the specific invalid memory operation. Exploitation requires user interaction with a crafted website, document, or embedded ActiveX control and grants the current user's rights.

The record

CVE
CVE-2020-1061
Published
May 21, 2020
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0.10240.0 <publication

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <publication
Microsoft · Windows Server 2019version=10.0.17763.0 <publication
Microsoft · Windows 7version=6.1.0 <publication
Microsoft · Windows 10 Version 1909version=10.0.0 <publication
Microsoft · Windows 10 Version 1803version=10.0.0 <publication
Microsoft · Windows 8.1version=6.3.0 <publication
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <publication
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <publication
Microsoft · Windows Server 2012version=6.2.9200.0 <publication
Microsoft · Windows Server 2016version=10.0.14393.0 <publication
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <publication
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <publication
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <publication
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <publication
Microsoft · Windows Server, version 1903 (Server Core installation)version=10.0.0 <publication
Microsoft · Windows 7 Service Pack 1version=6.1.0 <publication
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <publication
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <publication
Microsoft · Windows Server, version 1803 (Server Core installation)version=10.0.0 <publication
Microsoft · Windows 10 Version 1709version=10.0.0 <publication
Microsoft · Windows 10 Version 1809version=10.0.0 <publication; version=10.0.17763.0 <publication
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <publication
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <publication
Microsoft · Windows Server, version 1909 (Server Core installation)version=10.0.0 <publication
Microsoft · Windows 10 Version 1903version=10.0.0 <publication

Published CVSS scores

7.5MicrosoftCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
6.7MicrosoftCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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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