# CVE-2021-42021: Path traversal in Siveillance Video DLNA Server

> An unauthenticated remote attacker can exploit a path traversal flaw to read arbitrary files outside the web directory, exposing sensitive information.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-p86h-xf2r-jw9g

## What is CVE-2021-42021?

CVE-2021-42021 is a high-severity path traversal vulnerability in Siemens Siveillance Video DLNA Server, published on 9 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in Siveillance Video DLNA Server (2019 R1), Siveillance Video DLNA Server (2019 R2), Siveillance Video DLNA Server (2019 R3), Siveillance Video DLNA Server (2020 R1), Siveillance Video DLNA Server (2020 R2), Siveillance Video DLNA Server (2020 R3), Siveillance Video DLNA Server (2021 R1). The affected application contains a path traversal vulnerability that could allow to read arbitrary files on the server that are outside the application’s web document directory. An unauthenticated remote attacker could exploit this issue to access sensitive information for subsequent attacks.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), CWE-26 (Path Traversal: '/dir/../filename')

## Which versions are affected by CVE-2021-42021?

It affects 5 products.


Products: Siemens Siveillance Video Management Software 2019 R1, Siemens Siveillance Video Management Software 2019 R2, Siemens Siveillance Video Management Software 2019 R3, Siemens Siveillance Video Management Software 2020 R1, Siemens Siveillance Video Management Software 2020 R2.

## How do I fix CVE-2021-42021?

No fix has been published for CVE-2021-42021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42021 being exploited?

There is no known exploitation of CVE-2021-42021 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42021 and fix it if it is affected.

What it is: CVE-2021-42021 is a high-severity path traversal vulnerability in Siemens Siveillance Video DLNA Server, published on 9 Nov 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-2021-42021 in the wild and no public exploit code.

Affected product: Siemens Siveillance Video DLNA Server. 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-2021-42021/ (Markdown: https://insights.sbomify.com/CVE-2021-42021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42021
- OSV: https://osv.dev/vulnerability/CVE-2021-42021

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-42021/
Summaries are generated and may contain mistakes; the official description above is the record.