Multiple vulnerabilities in Microsoft .NET
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2025-21173 CVE-2025-21171 |
| CWE-ID | CWE-379 CWE-122 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
.NET Other software / Other software solutions .NET for Linux Universal components / Libraries / Software for developers Visual Studio Universal components / Libraries / Software for developers .NET for macOS Universal components / Libraries / Software for developers PowerShell for Linux Universal components / Libraries / Software for developers PowerShell for macOS Universal components / Libraries / Software for developers PowerShell Client/Desktop applications / Software for system administration |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Creation of temporary file in directory with insecure permissions
EUVDB-ID: #VU102800
Risk: Low
CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2025-21173
CWE-ID:
CWE-379 - Creation of Temporary File in Directory with Insecure Permissions
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privilege on the target system.
The vulnerability exists due to creation of temporary file in directory with insecure permissions in .NET. A local user can overwrite arbitrary file content and gain elevated privileges on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versions.NET: 8.0.0 - 9.0.0
.NET for Linux: 8.0.0 - 9.0.0
Visual Studio: 17.1.0 17.1.32210.238 - 17.10.9 17.10.35431.56
CPE2.3- cpe:2.3:a:microsoft:.net:8.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:.net:9.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:_net_for_linux:8.0.11:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:_net_for_linux:9.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio:17.10.9:17.10.35431.56:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio:17.6.21:17.6.35430.205:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio:17.8.16:17.8.35430.204:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21173
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Heap-based buffer overflow
EUVDB-ID: #VU102801
Risk: Medium
CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2025-21171
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in .NET. A remote attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versions.NET for Linux: 9.0.0
.NET for macOS: 9.0.0
.NET: 9.0 - 9.0.0
Visual Studio: 17.1.0 17.1.32210.238 - 17.10.9 17.10.35431.56
PowerShell: before 7.5.0
PowerShell for Linux: before 7.5.0 7.5.0
PowerShell for macOS: before 7.5.0 7.5.0
CPE2.3- cpe:2.3:a:microsoft:_net_for_macos:9.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell_for_linux:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell_for_macos:*:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21171
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
