CVE-2021-38655

Published: Sep 15, 2021Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD (Secondary)

Description

Microsoft Excel Remote Code Execution Vulnerability

Affected (8)

Products: Microsoft: 365 Apps, Excel, Office, Office Online Server, Office Web Apps

5 products

Office Online Server

Office Web Apps

Configuration A

8 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft Excel	Version 2013
Microsoft Excel	Version 2013 sp1
Microsoft Excel	Version 2016
Microsoft Office	Version 2019
Microsoft Office	Version 2019
Microsoft Office Online Server	All versions
Microsoft Office Web Apps	Version 2013 sp1

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (4)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38655

Source: secure@microsoft.com

PatchVendor Advisory

https://www.zerodayinitiative.com/advisories/ZDI-21-1080/

Source: secure@microsoft.com

Third Party AdvisoryVDB Entry

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38655

Source: af854a3a-2127-422b-91ae-364da2661108

PatchVendor Advisory

https://www.zerodayinitiative.com/advisories/ZDI-21-1080/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party AdvisoryVDB Entry

Timeline

No history available yet.