CVE-2026-97770

Analyzed Analyzed - Analysis Complete

Microsoft Office Excel Stack-Based Buffer Overflow

Publication date: 2026-10-13

Last updated on: 2026-10-15

Assigner: Microsoft Corporation

Description

Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-97770

EUVD

EUVD-2026-99824

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_online_server	to 16.0.10417.20228 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow in Microsoft Office Excel. It allows an attacker to execute arbitrary code remotely without authentication by exploiting a flaw in how Excel handles certain data.

Detection Guidance

Detecting this vulnerability requires monitoring for unusual Excel file processing or network activity. Check for crashes in Excel.exe, unexpected memory usage spikes, or network connections initiated by Excel. Use tools like Process Monitor to log Excel.exe behavior and Wireshark to inspect network traffic for suspicious Excel file downloads or connections.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your computer. It requires user interaction like opening a specially crafted file.

Compliance Impact

This vulnerability allows remote code execution via a stack-based buffer overflow in Microsoft Office Excel. Such unauthorized code execution could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information confidentiality).

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Office Excel versions immediately. Disable Excel macros if not required and restrict network access to Office applications through firewalls.

Hi! I’m here to help you understand CVE-2026-97770. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70