CVE-2021-34532 ASP.NET Core and Visual Studio Information Disclosure Vulnerability
An information disclosure vulnerability in ASP.NET Core and Visual Studio allows attackers to read sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-34532?
CVE-2021-34532 is a medium-severity vulnerability in Microsoft Visual Studio 2019, published on 12 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
Which versions are affected by CVE-2021-34532?
7 open source packages ship an affected version, including Microsoft.AspNetCore.Authentication.JwtBearer and aspnet-core. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 2.1.0 | 2.1.29 |
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 2.1.0 | 2.1.29 |
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 3.0.0 | 3.1.18 |
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 3.0.0 | 3.1.18 |
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 5.0.0 | 5.0.9 |
Microsoft.AspNetCore.Authentication.JwtBearer NuGet | From 5.0.0 | 5.0.9 |
1 more packages
aspnet-core Bitnami | From 2.1.0 | 2.1.3, 3.1.18, 5.0.9 |
Products include Microsoft Asp.net Core, Microsoft Visual Studio 2019.
How do I fix CVE-2021-34532?
Upgrade Microsoft.AspNetCore.Authentication.JwtBearer to a fixed version for your release line: 2.1.29, 3.1.18 or 5.0.9.
Is CVE-2021-34532 being exploited?
There is no known exploitation of CVE-2021-34532 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Visual Studio 2019
- CVE-2025-55315 ASP.NET Security Feature Bypass Vulnerability
- CVE-2026-88092 ASP.NET Core Tampering Vulnerability
- CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability
- CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability
- CVE-2020-0603 Remote code execution in ASP.NET Core
Sources
Also known as BIT-aspnet-core-2021-34532, GHSA-q7cg-43mg-qp69.