Microsoft Word heap-based overflow

Summaryinfo

A vulnerability labeled as critical has been found in Microsoft Word. Affected by this issue is some unknown functionality. Such manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2025-47169. The attack can be launched remotely. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft Word (the affected version unknown) and classified as critical. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

The weakness was disclosed 06/10/2025 as confirmed security update guide (Website). The advisory is shared for download at msrc.microsoft.com. This vulnerability is handled as CVE-2025-47169. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for 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 $0-$5k (estimation calculated on 07/09/2025).

The vulnerability scanner Nessus provides a plugin with the ID 238100 (Security Updates for Microsoft Office Products (June 2025) (macOS)), 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 (238100) and EUVD (EUVD-2025-17730). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Word Processing Software

Vendor

• Microsoft

Name

• Word

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Once again VulDB remains the best source for vulnerability data.

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