# CVE-2021-33721: Command injection in SINEC NMS

> An authenticated administrator can execute arbitrary code with system privileges via command injection in batch operations.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-63f9-382x-9vr8

## What is CVE-2021-33721?

CVE-2021-33721 is a high-severity command injection vulnerability in Siemens SINEC NMS, published on 10 Aug 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2). The affected application incorrectly neutralizes special elements when creating batch operations which could lead to command injection. An authenticated remote attacker with administrative privileges could exploit this vulnerability to execute arbitrary code on the system with system privileges.

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

## Which versions are affected by CVE-2021-33721?

It affects 1 product.


Products: Siemens Sinec Network Management System.

## How do I fix CVE-2021-33721?

No fix has been published for CVE-2021-33721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33721 being exploited?

There is no known exploitation of CVE-2021-33721 in the wild and no public exploit code.

## Other vulnerabilities in Siemens SINEC NMS

- [CVE-2021-37201](https://insights.sbomify.com/CVE-2021-37201/): Cross-site request forgery in SINEC NMS (high 8.8)
- [CVE-2020-25237](https://insights.sbomify.com/CVE-2020-25237/): Path traversal in SINEC NMS (high 8.1)
- [CVE-2021-37200](https://insights.sbomify.com/CVE-2021-37200/): Path traversal in SINEC NMS (high 7.7)
- [CVE-2022-25311](https://insights.sbomify.com/CVE-2022-25311/): Privilege escalation in SINEC NMS (high 7.3)
- [CVE-2022-24281](https://insights.sbomify.com/CVE-2022-24281/): SQL injection in SINEC NMS (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33721 and fix it if it is affected.

What it is: CVE-2021-33721 is a high-severity command injection vulnerability in Siemens SINEC NMS, published on 10 Aug 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33721 in the wild and no public exploit code.

Affected product: Siemens SINEC NMS. 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-2021-33721/ (Markdown: https://insights.sbomify.com/CVE-2021-33721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33721
- OSV: https://osv.dev/vulnerability/CVE-2021-33721

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33721/
Summaries are generated and may contain mistakes; the official description above is the record.