# CVE-2021-44199: DLL hijacking could lead to denial of service

> Attackers can cause denial of service in Acronis Windows products via DLL hijacking, requiring users to upgrade to patched builds.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:** 29 Nov 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-r24c-4jp9-g34v

## What is CVE-2021-44199?

CVE-2021-44199 is a medium-severity vulnerability in Acronis Cyber Protect, published on 29 Nov 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

DLL hijacking could lead to denial of service. The following products are affected: Acronis Cyber Protect 15 (Windows) before build 28035, Acronis Agent (Windows) before build 27305, Acronis Cyber Protect Home Office (Windows) before build 39612

Weakness: CWE-427 (Uncontrolled Search Path Element)

## Which versions are affected by CVE-2021-44199?

It affects 3 products.


Products: Acronis Agent, Acronis Cyber Protect, Acronis Cyber Protect Home Office.

## How do I fix CVE-2021-44199?

No fix has been published for CVE-2021-44199 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-44199 being exploited?

There is no known exploitation of CVE-2021-44199 in the wild and no public exploit code.

## Other vulnerabilities in Acronis Cyber Protect

- [CVE-2022-45451](https://insights.sbomify.com/CVE-2022-45451/): Privilege escalation in Acronis Agent (high 8.8)
- [CVE-2023-41743](https://insights.sbomify.com/CVE-2023-41743/): Privilege escalation in Acronis Cyber Protect 15 (high 8.8)
- [CVE-2026-28727](https://insights.sbomify.com/CVE-2026-28727/): Privilege escalation in Acronis Cyber Protect 17 (high 7.8)
- [CVE-2023-41744](https://insights.sbomify.com/CVE-2023-41744/): Privilege escalation in Acronis Agent (high 7.8)
- [CVE-2021-44204](https://insights.sbomify.com/CVE-2021-44204/): Local privilege escalation via named pipe due to improper access control checks (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-44199 and fix it if it is affected.

What it is: CVE-2021-44199 is a medium-severity vulnerability in Acronis Cyber Protect, published on 29 Nov 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-2021-44199 in the wild and no public exploit code.

Affected product: Acronis Cyber Protect. 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-2021-44199/ (Markdown: https://insights.sbomify.com/CVE-2021-44199/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-44199
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-44199
- OSV: https://osv.dev/vulnerability/CVE-2021-44199

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-44199/
Summaries are generated and may contain mistakes; the official description above is the record.