# CVE-2020-8109: Bitdefender ace.xmd parser out-of-bounds write (VA-8772)

> An out-of-bounds write in the Bitdefender ACE parser allows attackers to cause a denial of service via crafted files.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:** 1 Oct 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-6xmc-rxq5-vjwm

## What is CVE-2020-8109?

CVE-2020-8109 is a medium-severity memory corruption vulnerability in Bitdefender Engines, published on 1 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been discovered in the ace.xmd parser that results from a lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. This can result in denial-of-service. This issue affects: Bitdefender Engines version 7.84892 and prior versions.

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

## Which versions are affected by CVE-2020-8109?

It affects 1 product.


Products: Bitdefender Engines.

## How do I fix CVE-2020-8109?

No fix has been published for CVE-2020-8109 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8109 being exploited?

There is no known exploitation of CVE-2020-8109 in the wild and no public exploit code.

## Other vulnerabilities in Bitdefender Engines

- [CVE-2020-8100](https://insights.sbomify.com/CVE-2020-8100/): Incomplete validation in detection code in Bitdefender Engines (VA-8589) (critical 9.0)
- [CVE-2022-3369](https://insights.sbomify.com/CVE-2022-3369/): Improper handling of registry symbolic links in Bitdefender Engines (high 8.6)
- [CVE-2023-3633](https://insights.sbomify.com/CVE-2023-3633/): Out of Bounds Memory Corruption Issue in CEVA Engine (high 8.1)
- [CVE-2020-8110](https://insights.sbomify.com/CVE-2020-8110/): Bitdefender ceva_emu.cvd module denial-of-service (VA-8766) (medium 5.9)
- [CVE-2020-15731](https://insights.sbomify.com/CVE-2020-15731/): Local Privilege Escalation in Bitdefender Engines (VA-8953) (low 3.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8109 and fix it if it is affected.

What it is: CVE-2020-8109 is a medium-severity memory corruption vulnerability in Bitdefender Engines, published on 1 Oct 2020. 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-2020-8109 in the wild and no public exploit code.

Affected product: Bitdefender Engines. 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-2020-8109/ (Markdown: https://insights.sbomify.com/CVE-2020-8109/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8109
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8109
- OSV: https://osv.dev/vulnerability/CVE-2020-8109

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8109/
Summaries are generated and may contain mistakes; the official description above is the record.