Windows Rich Text Edit Control Remote Code Execution Vulnerability

Source data

Overview

Heap-based buffer overflow in Windows Rich Text Edit Control allows an unauthorized attacker to execute code over a network.

Impact & technical details

Remote Code Execution

Are the updates for Microsoft Office LTSC for Mac 2021 and 2024 currently available? Yes. As of October 15, 2025, the security update for Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac are available. Customers running Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac should ensure the update is installed to be protected from this vulnerability.

How could an attacker exploit this vulnerability? An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required..

CVSS base score

9.8 / 10

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Microsoft 365 Apps for Enterprise for 32-bit Systems
• Microsoft 365 Apps for Enterprise for 64-bit Systems
• Microsoft Office 365 for Mac
• Microsoft Office LTSC 2021 for 32-bit editions
• Microsoft Office LTSC 2021 for 64-bit editions
• Microsoft Office LTSC 2024 for 32-bit editions
• Microsoft Office LTSC 2024 for 64-bit editions
• Microsoft Office LTSC for Mac 2021

Source guidance

Remediation

• Release Notes

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5127648 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft security update · 5126651 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126655 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126657 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126646 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126653 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127646 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126868 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126835 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126836 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)