# CVE-2021-30721: Information disclosure in macOS

> An attacker in a privileged network position can leak sensitive user information due to a path handling issue in macOS.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-v77v-xvcj-46mx

## What is CVE-2021-30721?

CVE-2021-30721 is a medium-severity vulnerability in Apple Mac Os X, published on 8 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A path handling issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-003 Catalina, Security Update 2021-004 Mojave. An attacker in a privileged network position may be able to leak sensitive user information.

## Which versions are affected by CVE-2021-30721?

It affects 2 products.


Products: Apple Mac Os X, Apple Macos.

## How do I fix CVE-2021-30721?

No fix has been published for CVE-2021-30721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30721 being exploited?

There is no known exploitation of CVE-2021-30721 in the wild and no public exploit code.

## Other vulnerabilities in Apple Mac Os X

- [CVE-2014-7169](https://insights.sbomify.com/CVE-2014-7169/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2014-6271](https://insights.sbomify.com/CVE-2014-6271/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2012-1823](https://insights.sbomify.com/CVE-2012-1823/): PHP-CGI Query String Parameter (critical 9.8, exploited in the wild)
- [CVE-2021-30713](https://insights.sbomify.com/CVE-2021-30713/): Apple macOS Unspecified (high 7.8, exploited in the wild)
- [CVE-2019-8526](https://insights.sbomify.com/CVE-2019-8526/): Apple macOS Use-After-Free (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30721 and fix it if it is affected.

What it is: CVE-2021-30721 is a medium-severity vulnerability in Apple Mac Os X, published on 8 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-30721 in the wild and no public exploit code.

Affected product: Apple Mac Os X. 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-2021-30721/ (Markdown: https://insights.sbomify.com/CVE-2021-30721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30721
- OSV: https://osv.dev/vulnerability/CVE-2021-30721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30721/
Summaries are generated and may contain mistakes; the official description above is the record.