The following advisory data is extracted from:

https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_0382.json

Red Hat officially shut down their mailing list notifications October 10, 2023.  Due to this, Packet Storm has recreated the below data as a reference point to raise awareness.  It must be noted that due to an inability to easily track revision updates without crawling Red Hat's archive, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.

- Packet Storm Staff




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Red Hat Security Advisory

Synopsis:           Important: .NET 9.0 security update
Advisory ID:        RHSA-2025:0382-03
Product:            Red Hat Enterprise Linux
Advisory URL:       https://access.redhat.com/errata/RHSA-2025:0382
Issue date:         2025-01-16
Revision:           03
CVE Names:          CVE-2025-21171
====================================================================

Summary: 

An update for .NET 9.0 is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.




Description:

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.102 and .NET Runtime 9.0.1.

Security Fix(es):

* dotnet: .NET Remote Code Execution Vulnerability (CVE-2025-21171)
* dotnet: .NET and Visual Studio Remote Code Execution Vulnerability (CVE-2025-21172)
* dotnet: .NET Elevation of Privilege Vulnerability (CVE-2025-21173)
* dotnet: .NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability (CVE-2025-21176)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.Security Fix(es):

* dotnet: .NET Elevation of Privilege Vulnerability (CVE-2025-21173)

* dotnet: .NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability (CVE-2025-21176)

* dotnet: .NET and Visual Studio Remote Code Execution Vulnerability (CVE-2025-21172)

* dotnet: .NET Remote Code Execution Vulnerability (CVE-2025-21171)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.


Solution:

https://access.redhat.com/articles/11258



CVEs:

CVE-2025-21171

References:

https://access.redhat.com/security/updates/classification/#important
https://bugzilla.redhat.com/show_bug.cgi?id=2337893
https://bugzilla.redhat.com/show_bug.cgi?id=2337926
https://bugzilla.redhat.com/show_bug.cgi?id=2337927
https://bugzilla.redhat.com/show_bug.cgi?id=2337958