---
id: CVE-2025-62556
title: >-
  Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized
  attacker to execute code locally.
summary: >-
  Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized
  attacker to execute code locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-822
vendor: microsoft
product: 365_apps
affected:
  - 365_apps
  - excel = 2016
  - office = 2019
  - office_long_term_servicing_channel = 2021
  - office_long_term_servicing_channel = 2024
  - office_online_server < 16.0.10417.20075
patched:
  - office_online_server 16.0.10417.20075
published: '2025-12-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:10:00.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62556'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62556'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.00558
epssPercentile: 0.45182
ingestedAt: '2026-10-14T21:57:04.758Z'
---

## Overview

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

## Affected

- `365_apps`
- `excel = 2016`
- `office = 2019`
- `office_long_term_servicing_channel = 2021`
- `office_long_term_servicing_channel = 2024`
- `office_online_server < 16.0.10417.20075`

## Remediation

Upgrade past the affected range:

- `office_online_server 16.0.10417.20075`