# CVE-2021-45760: Null dereference in n/a

> Attackers can cause a Denial of Service in GPAC via an invalid memory address dereference in the gf_list_last function.

- **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:** 13 Jan 2022
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-45760, GHSA-jp4c-q8r4-7qv2, UBUNTU-CVE-2021-45760

## What is CVE-2021-45760?

CVE-2021-45760 is a medium-severity vulnerability in Gpac Gpac, published on 13 Jan 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 v1.1.0 was discovered to contain an invalid memory address dereference via the function gf_list_last(). This vulnerability allows attackers to cause a Denial of Service (DoS).

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-45760?

It affects 1 product.


Products: Gpac Gpac.

## How do I fix CVE-2021-45760?

Upgrade to a fixed version.

## Is CVE-2021-45760 being exploited?

There is no known exploitation of CVE-2021-45760 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-2021-45760 and fix it if it is affected.

What it is: CVE-2021-45760 is a medium-severity vulnerability in Gpac Gpac, published on 13 Jan 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-2021-45760 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-2021-45760/ (Markdown: https://insights.sbomify.com/CVE-2021-45760/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45760
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45760
- OSV: https://osv.dev/vulnerability/CVE-2021-45760

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45760/
Summaries are generated and may contain mistakes; the official description above is the record.