Buffer overflow in Microsoft Excel

Published: 2007-02-02 | Updated: 2016-12-06
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2007-0671
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Microsoft Office Subscribe
Microsoft Project
Microsoft Office for Mac
Microsoft Visio
Word Viewer
Excel Viewer
Vendor Microsoft

Security Advisory

This security advisory describes one critical risk vulnerability.

1) Buffer overflow

Severity: Critical

CVSSv3: 8.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2007-0671

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer


The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when handling malformed records in Excel files. A remote attacker can create a specially crafted Excel file, trick the victim into opening it and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: this vulnerability is being actively exploited.


Install the following patch:

Microsoft Office 2000 Service Pack 3 — Download the update (KB 929062)

Microsoft Office XP Service Pack 3 — Download the update (KB929063)

Microsoft Office 2003 Service Pack 2 — Download the update (KB929064)

Microsoft Project 2000 Service Release 1 — Download the update (KB929062)

Microsoft Project 2002 Service Pack 1 — Download the update (KB929063)

Microsoft Visio 2002 Service Pack 2 — Download the update (KB929063)

Microsoft Office 2004 for Mac — Download the update (KB932185)

Vulnerable software versions

Microsoft Office: 2000 Service Pack 3, 2003, XP

Microsoft Project: 2000, 2002

Microsoft Office for Mac: 2004

Microsoft Visio: 2002

Word Viewer: 2003

Excel Viewer: 2003

CPE External links


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.