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TI-2021-19672 Aliases CVE-2021-43877

ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

Priority MEDIUM 41Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00733 54th percentileScored 2026-11-07
Fix Fixed Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) (Microsoft): 16.7.23Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) (Microsoft): 16.9.15+6 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)16.0.0 to before 16.7.2316.7.23Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)15.0.0 to before 16.9.1516.9.15Patch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)16.11.0 to before 16.11.816.11.8Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.017.0.0 to before 17.0.317.0.3Patch availableCNA
MicrosoftASP.NET Core 3.13.0 to before 3.1.223.1.22Patch availableCNA
MicrosoftASP.NET Core 5.05.0 to before 5.0.135.0.13Patch availableCNA
MicrosoftASP.NET Core 6.06.0 to before 6.0.1016.0.101Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.117.0.0 to before 17.1.417.1.4Patch availableCNA
  • Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) VendorMicrosoft Affected 16.0.0 to before 16.7.23 Fixed in 16.7.23 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) VendorMicrosoft Affected 15.0.0 to before 16.9.15 Fixed in 16.9.15 Patch available CNA
  • Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) VendorMicrosoft Affected 16.11.0 to before 16.11.8 Fixed in 16.11.8 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.0 VendorMicrosoft Affected 17.0.0 to before 17.0.3 Fixed in 17.0.3 Patch available CNA
  • ASP.NET Core 3.1 VendorMicrosoft Affected 3.0 to before 3.1.22 Fixed in 3.1.22 Patch available CNA
  • ASP.NET Core 5.0 VendorMicrosoft Affected 5.0 to before 5.0.13 Fixed in 5.0.13 Patch available CNA
  • ASP.NET Core 6.0 VendorMicrosoft Affected 6.0 to before 6.0.101 Fixed in 6.0.101 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.1 VendorMicrosoft Affected 17.0.0 to before 17.1.4 Fixed in 17.1.4 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:asp.net_core:3.1:*:*:*:*:*:*:*3.1VulnerableMicrosoft
cpe:2.3:a:microsoft:asp.net_core:5.0:*:*:*:*:*:*:*5.0VulnerableMicrosoft
cpe:2.3:a:microsoft:asp.net_core:6.0:*:*:*:*:*:*:*6.0VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2019:16.7:*:*:*:*:*:*:*16.7VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2019:16.9:*:*:*:*:*:*:*16.9VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2019:16.11:*:*:*:*:*:*:*16.11VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2022:17.0:*:*:*:*:*:*:*17.0VulnerableMicrosoft
  • cpe:2.3:a:microsoft:asp.net_core:3.1:*:*:*:*:*:*:* Versions 3.1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:asp.net_core:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:asp.net_core:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2019:16.7:*:*:*:*:*:*:* Versions 16.7 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2019:16.9:*:*:*:*:*:*:* Versions 16.9 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2019:16.11:*:*:*:*:*:*:* Versions 16.11 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2022:17.0:*:*:*:*:*:*:* Versions 17.0 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) (Microsoft) Fixed in 16.7.23
  • Fix · CNA Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) (Microsoft) Fixed in 16.9.15
  • Fix · CNA Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) (Microsoft) Fixed in 16.11.8
  • Fix · CNA Microsoft Visual Studio 2022 version 17.0 (Microsoft) Fixed in 17.0.3
  • Fix · CNA ASP.NET Core 3.1 (Microsoft) Fixed in 3.1.22
  • Fix · CNA ASP.NET Core 5.0 (Microsoft) Fixed in 5.0.13
  • Fix · CNA ASP.NET Core 6.0 (Microsoft) Fixed in 6.0.101
  • Fix · CNA Microsoft Visual Studio 2022 version 17.1 (Microsoft) Fixed in 17.1.4

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 4 products
  • .NET Core 3.1 on Red Hat Enterprise Linux
  • .NET Core 5.0 on Red Hat Enterprise Linux
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43877
  2. 2026-11-02 CISA SSVC decision points changed
  3. 2026-11-02 Priority changed: LOW → MEDIUM

References

Patch 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
  • TI-2025-34970 ASP.NET Security Feature Bypass Vulnerability CVSS 3.1CRITICAL 9.9
  • TI-2024-14164 .NET Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2023-18092 ASP.NET Core Denial of Service Vulnerability CVSS 3.1HIGH 8.2
  • TI-2023-18392 ASP.NET Core Security Feature Bypass Vulnerability CVSS 3.1MEDIUM 6.2
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences