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HIGH · CVSS 8.8 CISA Known Exploited Vulnerability

CVE-2007-0671

Microsoft Office Excel Remote Code Execution Vulnerability

Microsoft Office

Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and possibly other Office products, allows remote user-assisted attackers to execute arbitrary code via unknown attack vectors, as demonstrated by Exploit-MSExcel.h in targeted zero-day attacks.

CVSS
8.8
HIGH
EPSS
43.2%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
3 Feb 2007
NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 12 August 2025. US federal agencies were required to remediate it by 2 September 2025.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 43.2%, which is higher than 98.7% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2007-0671 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2007-0671.

What does CVE-2007-0671 affect?

CVE-2007-0671 affects Microsoft Office. Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and possibly other Office products, allows remote user-assisted attackers to execute arbitrary code via unknown attack vectors, as demonstrated by Exploit-MSExcel.h in targeted zero-day attacks.

How severe is CVE-2007-0671?

CVE-2007-0671 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 43.2%, higher than 98.7% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 2 September 2025.

How should organisations respond to CVE-2007-0671?

Apply the vendor patch for Microsoft Office as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.