# CVE-2021-43814: Heap-based OOB write when parsing dwarf DIE info in Rizin

> A heap-based out-of-bounds write in Rizin allows attackers to execute arbitrary code or cause a crash by tricking users into opening a malicious AMD64 ELF binary.

- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/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:** No
- **Published:** 13 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-hqqp-vjcm-mw8r

## What is CVE-2021-43814?

CVE-2021-43814 is a high-severity memory corruption vulnerability in rizinorg rizin, published on 13 Dec 2021. 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

Rizin is a UNIX-like reverse engineering framework and command-line toolset. In versions up to and including 0.3.1 there is a heap-based out of bounds write in parse_die() when reversing an AMD64 ELF binary with DWARF debug info. When a malicious AMD64 ELF binary is opened by a victim user, Rizin may crash or execute unintended actions. No workaround are known and users are advised to upgrade.

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

## Which versions are affected by CVE-2021-43814?

It affects 1 product.


Products: Rizin Rizin.

## How do I fix CVE-2021-43814?

No fix has been published for CVE-2021-43814 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43814 being exploited?

There is no known exploitation of CVE-2021-43814 in the wild and no public exploit code.

## Other vulnerabilities in rizinorg rizin

- [CVE-2024-31668](https://insights.sbomify.com/CVE-2024-31668/): rizin before v0.6.3 is vulnerable to Improper Neutralization of Special Elements via meta_set function in librz/analysis/meta. (critical 9.1)
- [CVE-2023-40022](https://insights.sbomify.com/CVE-2023-40022/): Rizin vulnerable to Integer Overflow in C++ demangler logic (high 7.8)
- [CVE-2021-3674](https://insights.sbomify.com/CVE-2021-3674/): Memory corruption in rizin (high 7.8)
- [CVE-2023-27590](https://insights.sbomify.com/CVE-2023-27590/): Rizin has stack-based buffer overflow when parsing GDB registers profile files (high 7.8)
- [CVE-2022-36039](https://insights.sbomify.com/CVE-2022-36039/): Out-of-bounds write when parsing DEX files in Rizin (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43814 and fix it if it is affected.

What it is: CVE-2021-43814 is a high-severity memory corruption vulnerability in rizinorg rizin, published on 13 Dec 2021. 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-2021-43814 in the wild and no public exploit code.

Affected product: rizinorg rizin. 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-2021-43814/ (Markdown: https://insights.sbomify.com/CVE-2021-43814/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43814
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43814
- OSV: https://osv.dev/vulnerability/CVE-2021-43814

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43814/
Summaries are generated and may contain mistakes; the official description above is the record.