What’s Vulnerable › Vulnerabilities

CVE-2020-16937: .NET Framework Information Disclosure Vulnerability

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-16 · updated 2026-06-17

Description

<p>An information disclosure vulnerability exists when the .NET Framework improperly handles objects in memory. An attacker who successfully exploited the vulnerability could disclose contents of an affected system's memory.</p> <p>To exploit the vulnerability, an authenticated attacker would need to run a specially crafted application.</p> <p>The update addresses the vulnerability by correcting how the .NET Framework handles objects in memory.</p>

Affected products

• Microsoft .NET Framework: 2.0-sp2, 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2 (+5)
• Microsoft .NET Framework 2.0 Service Pack 2: from 2.0.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5: from 3.5.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5.1: from 3.5.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2: from 3.5.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2: from 3.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before publication — fixed in publication
• Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before publication — fixed in publication
• Microsoft .NET Framework 4.5.2: from 4.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 4.6: from 4.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2: from 4.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 4.8: from 4.8.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft .NET Framework 2.0 Service Pack 2 publication; Microsoft .NET Framework 3.5 publication; Microsoft .NET Framework 3.5.1 publication; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 publication; Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 publication; Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 publication; Microsoft .NET Framework 3.5 AND 4.7.2 publication; Microsoft .NET Framework 3.5 AND 4.8 publication; Microsoft .NET Framework 4.5.2 publication; Microsoft .NET Framework 4.6 publication; Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 publication; Microsoft .NET Framework 4.8 publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16937
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16937

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