# CVE-2021-3674: Memory corruption in rizin

> Crafted ELF headers in Rizin can cause out-of-bounds reads leading to memory corruption and potential code execution.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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:** 24 Mar 2023
- **Updated:** 25 Feb 2025
- **Also known as:** GHSA-28pv-xxcq-fr89

## What is CVE-2021-3674?

CVE-2021-3674 is a high-severity memory corruption vulnerability in rizin, published on 24 Mar 2023. 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

A flaw was found in rizin. The create_section_from_phdr function allocates space for ELF section data by processing the headers. Crafted values in the headers can cause out of bounds reads, which can lead to memory corruption and possibly code execution through the binary object's callback function.

Weakness: CWE-125 (Out-of-bounds Read), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-3674?

It affects 1 product.


Products: Rizin Rizin.

## How do I fix CVE-2021-3674?

No fix has been published for CVE-2021-3674 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3674 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3674 exists.

## Other vulnerabilities in 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-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)
- [CVE-2022-36040](https://insights.sbomify.com/CVE-2022-36040/): Rizin Out-of-bounds Write vulnerability in pyc/marshal.c (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3674 and fix it if it is affected.

What it is: CVE-2021-3674 is a high-severity memory corruption vulnerability in rizin, published on 24 Mar 2023. 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3674 exists.

Affected product: 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-2021-3674/ (Markdown: https://insights.sbomify.com/CVE-2021-3674/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3674
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3674
- OSV: https://osv.dev/vulnerability/CVE-2021-3674

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-3674/
Summaries are generated and may contain mistakes; the official description above is the record.