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ReviewHigh

CVE-2020-1066

Microsoft Microsoft .NET Framework 3.0 Service Pack 2, Microsoft .NET Framework 3.5.1, .net framework

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.

CVSS
7.8
EPSS
2.44%
83.2% percentile
CISA KEV
Not listed
Published
2020.05.22
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.44%
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Microsoft Microsoft .NET Framework 3.0 Service Pack 2, Microsoft .NET Framework 3.5.1, .net framework
Affected versions
>= 3.0.0 < publication, >= 3.5.0 < publication, 3.0, 3.5.1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Microsoft .NET Framework 3.0 Service Pack 2, Microsoft .NET Framework 3.5.1, .net framework and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available