# CVE-2009-2477: Memory corruption in n/a

> Remote attackers can execute arbitrary code in Mozilla Firefox via a crafted document triggering uninitialized memory access in the JIT compiler.

- **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 Jul 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-p5fj-7pgr-xv7v

## What is CVE-2009-2477?

CVE-2009-2477 is a critical memory corruption vulnerability in Mozilla Firefox, published on 15 Jul 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

js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a document containing P and FONT elements.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2009-2477?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2009-2477?

No fix has been published for CVE-2009-2477 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-2477 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-2477 exists.

Public exploit code:

- Mozilla Firefox 3.5 - Font tags Remote Buffer Overflow (exploitdb)
- Firefox 3.5 escape() Return Value Memory Corruption (metasploit)
- Mozilla Firefox 3.5 - 'Font tags' Remote HeapSpray (2) (exploitdb)
- Mozilla Firefox 3.5 - 'escape()' Return Value Memory Corruption (Metasploit) (exploitdb)
- Naenara Browser 3.5 (RedStar 3.0 Desktop) - 'JACKRABBIT' Client-Side Command Execution (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-2009-2477 and fix it if it is affected.

What it is: CVE-2009-2477 is a critical memory corruption vulnerability in Mozilla Firefox, published on 15 Jul 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-2009-2477 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-2009-2477/ (Markdown: https://insights.sbomify.com/CVE-2009-2477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-2477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-2477
- OSV: https://osv.dev/vulnerability/CVE-2009-2477

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From sbomify Insights: https://insights.sbomify.com/CVE-2009-2477/
Summaries are generated and may contain mistakes; the official description above is the record.