CVE Vulnerabilities

CVE-2025-21354

Untrusted Pointer Dereference

Published: Jan 14, 2025 | Modified: Aug 25, 2025
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
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Microsoft Excel Remote Code Execution Vulnerability

Weakness

The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

Affected Software

NameVendorStart VersionEnd Version
365_appsMicrosoft- (including)- (including)
OfficeMicrosoft2019 (including)2019 (including)
Office_long_term_servicing_channelMicrosoft2021 (including)2021 (including)
Office_long_term_servicing_channelMicrosoft2024 (including)2024 (including)
Office_online_serverMicrosoft*16.0.10416.20047 (excluding)

Extended Description

An attacker can supply a pointer for memory locations that the product is not expecting. If the pointer is dereferenced for a write operation, the attack might allow modification of critical state variables, cause a crash, or execute code. If the dereferencing operation is for a read, then the attack might allow reading of sensitive data, cause a crash, or set a variable to an unexpected value (since the value will be read from an unexpected memory location). There are several variants of this weakness, including but not necessarily limited to:

References