# CVE-2020-23321: Memory corruption in n/a

> Heap buffer overflow in JerryScript allows attackers to execute arbitrary code or cause denial of service via crafted JavaScript.

- **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:** 10 Jun 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-q6cq-2jc2-cpx5, UBUNTU-CVE-2020-23321

## What is CVE-2020-23321?

CVE-2020-23321 is a critical memory corruption vulnerability in Jerryscript Jerryscript, published on 10 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There is a heap-buffer-overflow at lit-strings.c:431 in lit_read_code_unit_from_utf8 in JerryScript 2.2.0.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2020-23321?

It affects 1 product.


Products: Jerryscript Jerryscript.

## How do I fix CVE-2020-23321?

No fix has been published for CVE-2020-23321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-23321 being exploited?

There is no known exploitation of CVE-2020-23321 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-2021-42863](https://insights.sbomify.com/CVE-2021-42863/): 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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-23321 and fix it if it is affected.

What it is: CVE-2020-23321 is a critical memory corruption vulnerability in Jerryscript Jerryscript, published on 10 Jun 2021. 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-2020-23321 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-2020-23321/ (Markdown: https://insights.sbomify.com/CVE-2020-23321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-23321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-23321
- OSV: https://osv.dev/vulnerability/CVE-2020-23321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-23321/
Summaries are generated and may contain mistakes; the official description above is the record.