# CVE-2021-26472: Unauthenticated remote command execution with SYSTEM privileges in Vembu products

> Unauthenticated attackers can execute arbitrary OS commands with SYSTEM privileges via the download.php API in Vembu backup products.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** No
- **Published:** 8 Jun 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-58h6-f6wr-w2hw

## What is CVE-2021-26472?

CVE-2021-26472 is a critical command injection vulnerability in n/a, published on 8 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 installed on Windows, the http API located at /consumerweb/secure/download.php. Using this command argument an unauthenticated attacker can execute arbitrary OS commands with SYSTEM privileges.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-26472?

It affects 2 products.


Products: Vembu Bdr Suite, Vembu Offsite Dr.

## How do I fix CVE-2021-26472?

No fix has been published for CVE-2021-26472 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26472 being exploited?

There is no known exploitation of CVE-2021-26472 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-26471](https://insights.sbomify.com/CVE-2021-26471/): Unauthenticated remote command execution in Vembu products (critical 9.8)
- [CVE-2021-26473](https://insights.sbomify.com/CVE-2021-26473/): Unauthenticated arbitrary file upload and command execution in Vembu products (critical 9.8)
- [CVE-2021-26474](https://insights.sbomify.com/CVE-2021-26474/): UNAUTHENTICATED SERVER SIDE REQUEST FORGERY IN VEMBU PRODUCTS (high 8.6)
- [CVE-2021-43458](https://insights.sbomify.com/CVE-2021-43458/): Privilege escalation in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26472 and fix it if it is affected.

What it is: CVE-2021-26472 is a critical command injection vulnerability in n/a, published on 8 Jun 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-2021-26472 in the wild and no public exploit code.

Affected product: n/a. 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-2021-26472/ (Markdown: https://insights.sbomify.com/CVE-2021-26472/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26472
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26472
- OSV: https://osv.dev/vulnerability/CVE-2021-26472

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26472/
Summaries are generated and may contain mistakes; the official description above is the record.