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Vulnerabilities

Vulnerability · CVE-2021-43877

ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

Published Dec 15, 2021 · catalog updated Nov 2, 2026 · asp.net core

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-43877. EPSS is 0.73%. Act only if a listed version of asp.net core is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.73%
Remediation
Advisory link
Affected products
cpe microsoft/asp.net core · cpe microsoft/visual studio 2019 · cpe microsoft/visual studio 2022

ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/asp.net core3.1
  • cpe microsoft/asp.net core5.0
  • cpe microsoft/asp.net core6.0
  • cpe microsoft/visual studio 201916.11
  • cpe microsoft/visual studio 201916.7
  • cpe microsoft/visual studio 201916.9
  • cpe microsoft/visual studio 202217.0

How to fix CVE-2021-43877

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    Seen in 3.1 · 5 other packages on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-43877. EPSS is 0.73%. Act only if a listed version of asp.net core is installed.

Which versions are affected?

Compare what you have installed with microsoft/asp.net core 3.1; microsoft/asp.net core 5.0; microsoft/asp.net core 6.0; microsoft/visual studio 2019 16.11. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.73%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

ASP.NET Core security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 15, 2021 · NIST NVD

    Detected

    ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

  2. Nov 2, 2026 · NIST NVD

    Updated

    ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

Sources

  • CVE.orgVulnerability recordCVE-2021-43877

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2021-43877

    ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • NIST NVDNov 3, 2026