# CVE-2021-28237: Memory corruption in n/a

> A heap-buffer overflow in LibreDWG allows attackers to execute arbitrary code or cause denial of service via crafted DWG files.

- **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:** Yes
- **Published:** 2 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rc9p-cjq8-2vpg, openSUSE-SU-2022:0155-1, openSUSE-SU-2024:12083-1

## What is CVE-2021-28237?

CVE-2021-28237 is a critical memory corruption vulnerability in Gnu Libredwg, published on 2 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

LibreDWG v0.12.3 was discovered to contain a heap-buffer overflow via decode_preR13.

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

## Which versions are affected by CVE-2021-28237?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libredwg` | SUSE:Package Hub 15 SP4 | All versions | 0.12.5-bp154.2.3.1 |
| `libredwg` | openSUSE:Leap 15.4 | All versions | 0.12.5-bp154.2.3.1 |
| `libredwg` | openSUSE:Tumbleweed | All versions | 0.12.5-2.1 |

Products: Gnu Libredwg.

## How do I fix CVE-2021-28237?

Apply the vendor's patch.

## Is CVE-2021-28237 being exploited?

There is no known exploitation of CVE-2021-28237 in the wild and no public exploit code.

## Other vulnerabilities in Gnu Libredwg

- [CVE-2022-35164](https://insights.sbomify.com/CVE-2022-35164/): Use after free in n/a (critical 9.8)
- [CVE-2019-20914](https://insights.sbomify.com/CVE-2019-20914/): Null dereference in n/a (critical 9.8)
- [CVE-2019-9774](https://insights.sbomify.com/CVE-2019-9774/): Memory corruption in n/a (critical 9.1)
- [CVE-2019-9775](https://insights.sbomify.com/CVE-2019-9775/): Information disclosure in n/a (critical 9.1)
- [CVE-2023-36271](https://insights.sbomify.com/CVE-2023-36271/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28237 and fix it if it is affected.

What it is: CVE-2021-28237 is a critical memory corruption vulnerability in Gnu Libredwg, published on 2 Dec 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-2021-28237 in the wild and no public exploit code.

Affected product: Gnu Libredwg. 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-2021-28237/ (Markdown: https://insights.sbomify.com/CVE-2021-28237/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28237
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28237
- OSV: https://osv.dev/vulnerability/CVE-2021-28237

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28237/
Summaries are generated and may contain mistakes; the official description above is the record.