# CVE-2006-5633: Null dereference in n/a

> Remote attackers can crash Firefox or Seamonkey by triggering a null dereference via specific DOM range operations, requiring user interaction to visit a malicious page.

- **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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 31 Oct 2006
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2006-5633, GHSA-vwr8-5r39-5qmj

## What is CVE-2006-5633?

CVE-2006-5633 is a medium-severity vulnerability in Mozilla Firefox, published on 31 Oct 2006. 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

Firefox 1.5.0.7 and 2.0, and Seamonkey 1.1b, allows remote attackers to cause a denial of service (crash) by creating a range object using createRange, calling selectNode on a DocType node (DOCUMENT_TYPE_NODE), then calling createContextualFragment on the range, which triggers a null dereference.  NOTE: the original Bugtraq post mentioned that code execution was possible, but followup analysis has shown that it is only a null dereference.

## Which versions are affected by CVE-2006-5633?

It affects 2 products.


Products: Mozilla Firefox, Mozilla Seamonkey.

## How do I fix CVE-2006-5633?

Upgrade to a fixed version.

## Is CVE-2006-5633 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-5633 exists.

Public exploit code:

- Mozilla Firefox 1.5.0.7/2.0 - 'createRange' Remote Denial of Service (exploitdb)

## Other vulnerabilities in Mozilla Firefox

- [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild)
- [CVE-2010-3765](https://insights.sbomify.com/CVE-2010-3765/): Mozilla Multiple Products Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-5633 and fix it if it is affected.

What it is: CVE-2006-5633 is a medium-severity vulnerability in Mozilla Firefox, published on 31 Oct 2006. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-5633 exists.

Affected product: Mozilla Firefox. 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-2006-5633/ (Markdown: https://insights.sbomify.com/CVE-2006-5633/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-5633
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-5633
- OSV: https://osv.dev/vulnerability/CVE-2006-5633

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-5633/
Summaries are generated and may contain mistakes; the official description above is the record.