Apr 2025: Microsoft Office Remote Code Execution Vulnerability
CVE-2025-26642 Published on April 8, 2025

Microsoft Office Remote Code Execution Vulnerability
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.

Vendor Advisory NVD

Weakness Types

Out-of-bounds Read

The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.

Integer Overflow or Wraparound

The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.


Products Associated with CVE-2025-26642

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-26642 are published in these products:

Microsoft Access
 
Microsoft Office Online Server
 
Microsoft Sharepoint Server
 
Microsoft 365 Apps
 
Microsoft Office
 
Microsoft Excel
 
Microsoft Office Long Term Servicing Channel
 
Microsoft Office 2021
 
Microsoft Sharepoint Server 2019
 
Microsoft Office 2019
 
Microsoft Office Macos 2021
 
Microsoft Office 2024
 
Microsoft Office Macos 2024
 
Microsoft Excel 2016
 
Microsoft Office 2016
 
Microsoft Access 2016
 

Affected Versions

Microsoft 365 Apps for Enterprise: Microsoft Access 2016: Microsoft Access 2016 (32-bit edition): Microsoft Excel 2016: Microsoft Office 2016: Microsoft Office 2019: Microsoft Office LTSC 2021: Microsoft Office LTSC 2024: Microsoft Office LTSC for Mac 2021: Microsoft Office LTSC for Mac 2024: Microsoft SharePoint Server 2019: Microsoft Office Online Server:

Exploit Probability

EPSS
0.94%
Percentile
75.86%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.