# CVE-2021-42863: Memory corruption in n/a

> A buffer overflow in JerryScript allows attackers to cause memory corruption, potentially leading to code execution or denial of service.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 May 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-8264-28h8-qcwg, UBUNTU-CVE-2021-42863

## What is CVE-2021-42863?

CVE-2021-42863 is a critical memory corruption vulnerability in Jerryscript Jerryscript, published on 12 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A buffer overflow in ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0 allows an attacker to construct a fake object or a fake arraybuffer with unlimited size.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-42863?

It affects 1 product.


Products: Jerryscript Jerryscript.

## How do I fix CVE-2021-42863?

No fix has been published for CVE-2021-42863 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42863 being exploited?

There is no known exploitation of CVE-2021-42863 in the wild and no public exploit code.

## Other vulnerabilities in Jerryscript Jerryscript

- [CVE-2023-36109](https://insights.sbomify.com/CVE-2023-36109/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-38961](https://insights.sbomify.com/CVE-2023-38961/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-22597](https://insights.sbomify.com/CVE-2020-22597/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-43453](https://insights.sbomify.com/CVE-2021-43453/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-41751](https://insights.sbomify.com/CVE-2021-41751/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42863 and fix it if it is affected.

What it is: CVE-2021-42863 is a critical memory corruption vulnerability in Jerryscript Jerryscript, published on 12 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-42863 in the wild and no public exploit code.

Affected product: Jerryscript Jerryscript. 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-2021-42863/ (Markdown: https://insights.sbomify.com/CVE-2021-42863/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42863
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42863
- OSV: https://osv.dev/vulnerability/CVE-2021-42863

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42863/
Summaries are generated and may contain mistakes; the official description above is the record.