Microsoft Windows up to Server 2025 Routing/Remote Access Service heap-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Microsoft Windows. The impacted element is an unknown function of the component Routing/Remote Access Service. Executing a manipulation can lead to heap-based overflow. This vulnerability is handled as CVE-2025-33066. The attack can be executed remotely. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft Windows. It has been declared as critical. This vulnerability affects an unknown functionality of the component Routing/Remote Access Service. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was released 06/10/2025 as confirmed security update guide (Website). The advisory is shared for download at msrc.microsoft.com. This vulnerability was named CVE-2025-33066. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $25k-$100k (estimation calculated on 06/12/2025).

The vulnerability scanner Nessus provides a plugin with the ID 238094 (KB5061072: Windows Server 2008 Security Update (June 2025)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (238094) and EUVD (EUVD-2025-17776). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10
• 10 21H2
• 10 22H2
• 10 1607
• 10 1809
• 11 22H2
• 11 23H2
• 11 24H2
• Server 2008 R2 SP1
• Server 2008 SP2
• Server 2012
• Server 2012 R2
• Server 2016
• Server 2019
• Server 2022
• Server 2022 23H2
• Server 2025

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

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Once again VulDB remains the best source for vulnerability data.

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