# CVE-2009-2953: Denial of service in n/a

> Remote attackers can cause a denial of service via CPU consumption in Mozilla Firefox by exploiting JavaScript handling of long location.hash strings.

- **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:** No
- **Published:** 24 Aug 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-7wrp-3pc5-gg9v

## What is CVE-2009-2953?

CVE-2009-2953 is a medium-severity denial of service vulnerability in Mozilla Firefox, published on 24 Aug 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

Mozilla Firefox 3.0.6 through 3.0.13, and 3.5.x, allows remote attackers to cause a denial of service (CPU consumption) via JavaScript code with a long string value for the hash property (aka location.hash), a related issue to CVE-2008-5715.

Weakness: CWE-399

## Which versions are affected by CVE-2009-2953?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2009-2953?

No fix has been published for CVE-2009-2953 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-2953 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-2953 exists.

Public exploit code:

- Mozilla Firefox 3.0.5 - location.hash Remote Crash (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-2009-2953 and fix it if it is affected.

What it is: CVE-2009-2953 is a medium-severity denial of service vulnerability in Mozilla Firefox, published on 24 Aug 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-2953 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-2009-2953/ (Markdown: https://insights.sbomify.com/CVE-2009-2953/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-2953
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-2953
- OSV: https://osv.dev/vulnerability/CVE-2009-2953

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-2953/
Summaries are generated and may contain mistakes; the official description above is the record.