# CVE-2009-0100: Memory corruption in n/a

> Remote attackers can execute arbitrary code by tricking users into opening a crafted Excel spreadsheet with malformed objects.

- **Severity:** Critical 9.3 (`AV:N/AC:M/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Apr 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-4mhf-pw3q-x8rp

## What is CVE-2009-0100?

CVE-2009-0100 is a critical memory corruption vulnerability in Microsoft Office, published on 15 Apr 2009. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Microsoft Office Excel 2000 SP3, 2002 SP3, 2003 SP3, and 2007 SP1; Excel in Microsoft Office 2004 and 2008 for Mac; Microsoft Office Excel Viewer and Excel Viewer 2003 SP3; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 do not properly parse the Excel spreadsheet file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet that contains a malformed object with "an offset and a two-byte value" that trigger a memory calculation error, aka "Memory Corruption Vulnerability."

Weakness: CWE-399

## Which versions are affected by CVE-2009-0100?

It affects 4 products.


Products: Microsoft Office, Microsoft Office Compatibility Pack for Word Excel Ppt 2007, Microsoft Office Excel, Microsoft Office Excel Viewer.

## How do I fix CVE-2009-0100?

No fix has been published for CVE-2009-0100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-0100 being exploited?

There is no known exploitation of CVE-2009-0100 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Office

- [CVE-2018-0798](https://insights.sbomify.com/CVE-2018-0798/): Microsoft Office Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2015-1770](https://insights.sbomify.com/CVE-2015-1770/): Microsoft Office Uninitialized Memory Use (high 8.8, exploited in the wild)
- [CVE-2006-2492](https://insights.sbomify.com/CVE-2006-2492/): Microsoft Word Malformed Object Pointer (high 8.8, exploited in the wild)
- [CVE-2018-0802](https://insights.sbomify.com/CVE-2018-0802/): Microsoft Office Memory Corruption (high 7.8, exploited in the wild)
- [CVE-2017-11882](https://insights.sbomify.com/CVE-2017-11882/): Microsoft Office Memory Corruption (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-0100 and fix it if it is affected.

What it is: CVE-2009-0100 is a critical memory corruption vulnerability in Microsoft Office, published on 15 Apr 2009. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2009-0100 in the wild and no public exploit code.

Affected product: Microsoft Office. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2009-0100/ (Markdown: https://insights.sbomify.com/CVE-2009-0100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-0100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-0100
- OSV: https://osv.dev/vulnerability/CVE-2009-0100

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From sbomify Insights: https://insights.sbomify.com/CVE-2009-0100/
Summaries are generated and may contain mistakes; the official description above is the record.