---
title: "CVE-2007-0671: Microsoft Office Excel Remote Code Execution Vulnerability"
url: https://erroneo.us/security/cve/CVE-2007-0671/
description: "CVE-2007-0671 (Microsoft Office): Exploited in the wild (CISA KEV). Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and…"
type: vulnerability-record
section: "Security Digest"
date_published: 2007-02-03
date_modified: 2026-01-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2007-0671"
kev: true
cvss: 8.8
epss: 0.43241
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2007-0671: Microsoft Office Excel Remote Code Execution Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Office. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-08-12, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-09-02 ; treat that as the outer limit, not the target.
- EPSS 43.2% , percentile 99: FIRST’s model estimates a 43.2% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

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.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-08-12; federal due date 2025-09-02. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 43.24% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [MS07-015](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015)
- [Listed in CISA KEV notes (learn.microsoft.com)](https://learn.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015)
- [CVE.org record CVE-2007-0671](https://www.cve.org/CVERecord?id=CVE-2007-0671)
- [NVD entry CVE-2007-0671](https://nvd.nist.gov/vuln/detail/CVE-2007-0671)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2007-0671)
- [ADV-2007-0463](http://www.vupen.com/english/advisories/2007/0463)
- [oval:org.mitre.oval:def:301](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A301)
- [31901](http://osvdb.org/31901)
- [microsoft.com](http://www.microsoft.com/technet/security/advisory/932553.mspx)
- [VU#613740](http://www.kb.cert.org/vuls/id/613740)
- [1017584](http://securitytracker.com/id?1017584)
- [avertlabs.com](http://www.avertlabs.com/research/blog/?p=191)
- [24008](http://secunia.com/advisories/24008)
- [TA07-044A](http://www.us-cert.gov/cas/techalerts/TA07-044A.html)
- [office-unspecified-code-execution(32178)](https://exchange.xforce.ibmcloud.com/vulnerabilities/32178)
- [vil.nai.com](http://vil.nai.com/vil/content/v_141393.htm)
- [22383](http://www.securityfocus.com/bid/22383)

---
Source page: https://erroneo.us/security/cve/CVE-2007-0671/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt