CVE-2025-29979 — Heap-based Buffer Overflow in Microsoft 365 Apps FOR Enterprise

CWE-122 — Heap-based Buffer OverflowCWE-787 — Out-of-bounds Write4 documents4 sources
Severity
7.8HIGHNVD
EPSS
0.8%
top 26.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
11
Microsoft 365 Apps FOR EnterpriseMicrosoft Office 2016Microsoft Office 2019+8 more
Timeline
PublishedMay 13

Description

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages12 packages

▶CVEListV5microsoft/office_online_server16.0.0.0 — 16.0.10417.20010
▶NVDmicrosoft/office_online_server< 16.0.10417.20010
▶CVEListV5microsoft/microsoft_office_201616.0.0 — 16.0.5500.1000
▶CVEListV5microsoft/microsoft_office_201919.0.0 — https://aka.ms/OfficeSecurityReleases
▶CVEListV5microsoft/microsoft_office_ltsc_202116.0.1 — https://aka.ms/OfficeSecurityReleases

🔴Vulnerability Details

2
CVEList
Microsoft Excel Remote Code Execution Vulnerability↗2025-05-13
▶
GHSA
GHSA-q2x2-x5wc-3cp8: Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally↗2025-05-13
▶

📋Vendor Advisories

1
Microsoft
Microsoft Excel Remote Code Execution Vulnerability↗2025-05-13
▶
CVE-2025-29979 — Heap-based Buffer Overflow | cvebase