# CVE-2007-0021: Memory corruption in n/a

> Remote attackers can cause denial of service or execute arbitrary code via format string specifiers in aim:// URIs in Apple iChat.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/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:** 23 Jan 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-4c3v-jr8f-g5h4

## What is CVE-2007-0021?

CVE-2007-0021 is a high-severity memory corruption vulnerability in n/a, published on 23 Jan 2007. 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

Format string vulnerability in Apple iChat 3.1.6 allows remote attackers to cause a denial of service (null pointer dereference and application crash) and possibly execute arbitrary code via format string specifiers in an aim:// URI.

## Which versions are affected by CVE-2007-0021?

It affects 1 product.


Products: Apple Ichat.

## How do I fix CVE-2007-0021?

No fix has been published for CVE-2007-0021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2007-0021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-0021 exists.

Public exploit code:

- Apple iChat 3.1.6 441 - 'aim://' URL Handler Format String (PoC) (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2007-0614](https://insights.sbomify.com/CVE-2007-0614/): Denial of service in n/a (high 7.8)
- [CVE-2004-0873](https://insights.sbomify.com/CVE-2004-0873/): Code injection in n/a (high 7.5)
- [CVE-2007-3746](https://insights.sbomify.com/CVE-2007-3746/): Memory corruption in n/a (medium 6.8)
- [CVE-2007-3747](https://insights.sbomify.com/CVE-2007-3747/): Memory corruption in n/a (medium 6.8)
- [CVE-2007-3748](https://insights.sbomify.com/CVE-2007-3748/): Memory corruption in n/a (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-0021 and fix it if it is affected.

What it is: CVE-2007-0021 is a high-severity memory corruption vulnerability in n/a, published on 23 Jan 2007. 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-2007-0021 exists.

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-2007-0021/ (Markdown: https://insights.sbomify.com/CVE-2007-0021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-0021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-0021
- OSV: https://osv.dev/vulnerability/CVE-2007-0021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-0021/
Summaries are generated and may contain mistakes; the official description above is the record.