CVE-2020-1066: .NET Framework Elevation of Privilege Vulnerability

Published May 12, 2020
·
Updated

.NET Framework Elevation of Privilege Vulnerability

Other sources

An elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level. To exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program. The update addresses the vulnerability by correcting how .NET Framework activates COM objects.

Microsoft

Affected Software

12 affected componentsFixes available
Microsoft .NET Framework=3.0-sp2
Microsoft Windows Server 2008=sp2
Microsoft .NET Framework=3.5.1
Microsoft Windows 7=sp1
Microsoft Windows Server 2008=r2-sp1
Microsoft .NET Framework=3.0
Microsoft .NET Framework=3.5.1
All of the following
Microsoft .NET Framework=3.0-sp2
Microsoft Windows Server 2008=sp2
All of the following
Microsoft .NET Framework=3.5.1
Any of the following
Microsoft Windows 7=sp1
Microsoft Windows Server 2008=r2-sp1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch KB4556406
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch KB4556403

Event History

May 12, 2020
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
May 21, 2020
CVE Published
via MITRE·10:52 PM
Data Sourced
via MITRE·10:52 PM
Description
Data Sourced
via NVD·11:15 PM
RemedyDescriptionSeverityAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2020-1066?

The severity of CVE-2020-1066 is high with a severity value of 7.8 out of 10.

2

How does CVE-2020-1066 affect Microsoft .NET Framework?

CVE-2020-1066 affects Microsoft .NET Framework versions 3.0 SP2 and 3.5.1.

3

How can an attacker exploit CVE-2020-1066?

To exploit CVE-2020-1066, an attacker would first need to access the local machine and then run a malicious program.

4

Is Microsoft Windows Server 2008 vulnerable to CVE-2020-1066?

No, Microsoft Windows Server 2008 SP2 and R2 SP1 are not vulnerable to CVE-2020-1066.

5

Where can I find more information about CVE-2020-1066?

You can find more information about CVE-2020-1066 at the following URL: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1066

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203