# CVE-2021-40592: Denial of service in n/a

> An attacker can cause a denial of service via infinite loop in GPAC by tricking a user into opening a malicious MP4 file.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 8 Jun 2022
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-40592, GHSA-h7xc-x3v8-qjhv, UBUNTU-CVE-2021-40592

## What is CVE-2021-40592?

CVE-2021-40592 is a medium-severity denial of service vulnerability in Gpac Gpac, published on 8 Jun 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

GPAC version before commit 71460d72ec07df766dab0a4d52687529f3efcf0a (version v1.0.1 onwards) contains loop with unreachable exit condition ('infinite loop') vulnerability in ISOBMFF reader filter, isoffin_read.c. Function isoffin_process() can result in DoS by infinite loop. To exploit, the victim must open a specially crafted mp4 file.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2021-40592?

It affects 1 product.


Products: Gpac Gpac.

## How do I fix CVE-2021-40592?

Apply the vendor's patch.

## Is CVE-2021-40592 being exploited?

There is no known exploitation of CVE-2021-40592 in the wild and no public exploit code.

## Other vulnerabilities in Gpac Gpac

- [CVE-2023-46427](https://insights.sbomify.com/CVE-2023-46427/): Null dereference in n/a (critical 9.8)
- [CVE-2023-46932](https://insights.sbomify.com/CVE-2023-46932/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-36190](https://insights.sbomify.com/CVE-2022-36190/): Use after free in n/a (critical 9.8)
- [CVE-2021-28300](https://insights.sbomify.com/CVE-2021-28300/): Null dereference in n/a (critical 9.8)
- [CVE-2020-11558](https://insights.sbomify.com/CVE-2020-11558/): Use after free in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40592 and fix it if it is affected.

What it is: CVE-2021-40592 is a medium-severity denial of service vulnerability in Gpac Gpac, published on 8 Jun 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-40592 in the wild and no public exploit code.

Affected product: Gpac Gpac. 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-2021-40592/ (Markdown: https://insights.sbomify.com/CVE-2021-40592/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40592
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40592
- OSV: https://osv.dev/vulnerability/CVE-2021-40592

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-40592/
Summaries are generated and may contain mistakes; the official description above is the record.