# CVE-2009-0647: Denial of service in n/a

> Remote attackers can crash Windows Live Messenger by sending a modified packet header, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Feb 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-vgwx-7mjc-5w5g

## What is CVE-2009-0647?

CVE-2009-0647 is a medium-severity denial of service vulnerability in n/a, published on 19 Feb 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

msnmsgr.exe in Windows Live Messenger (WLM) 2009 build 14.0.8064.206, and other 14.0.8064.x builds, allows remote attackers to cause a denial of service (application crash) via a modified header in a packet, as possibly demonstrated by a UTF-8.0 value of the charset field in the Content-Type header line.  NOTE: this has been reported as a format string vulnerability by some sources, but the provenance of that information is unknown.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2009-0647?

It affects 1 product.


Products: Microsoft Windows Live Messenger.

## How do I fix CVE-2009-0647?

No fix has been published for CVE-2009-0647 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-0647 being exploited?

There is no known exploitation of CVE-2009-0647 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2006-3250](https://insights.sbomify.com/CVE-2006-3250/): Memory corruption in n/a (medium 5.1)
- [CVE-2008-5828](https://insights.sbomify.com/CVE-2008-5828/): Information disclosure in n/a (medium 5.0)
- [CVE-2010-0278](https://insights.sbomify.com/CVE-2010-0278/): Denial of service in n/a (medium 4.3)
- [CVE-2007-5144](https://insights.sbomify.com/CVE-2007-5144/): Memory corruption in n/a (medium 4.3)
- [CVE-2006-6252](https://insights.sbomify.com/CVE-2006-6252/): Denial of service in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-0647 and fix it if it is affected.

What it is: CVE-2009-0647 is a medium-severity denial of service vulnerability in n/a, published on 19 Feb 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2009-0647 in the wild and no public exploit code.

Affected product: n/a. 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-2009-0647/ (Markdown: https://insights.sbomify.com/CVE-2009-0647/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-0647
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-0647
- OSV: https://osv.dev/vulnerability/CVE-2009-0647

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-0647/
Summaries are generated and may contain mistakes; the official description above is the record.