CVE-2026-20957
Unknown
Unknown - Not Provided
Integer Underflow in Microsoft Excel Enables Local Code Execution
Publication date: 2026-01-13
Last updated on: 2026-01-13
Assigner: Microsoft Corporation
Description
Description
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | office_excel | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| 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(). |
| CWE-191 | The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an integer underflow (wrap or wraparound) in Microsoft Office Excel that allows an unauthorized attacker to execute code locally on the affected system. [1]
How can this vulnerability impact me? :
This vulnerability can allow an unauthorized attacker to execute code locally, potentially leading to full compromise of the affected system including confidentiality, integrity, and availability impacts. [1]
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