# CVE-2021-34820: Path traversal in n/a

> Remote unauthenticated attackers can exploit directory traversal in Novus HTTP Server to access sensitive files via crafted HTTP GET requests.

- **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:** 19 Jul 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w7v3-fvcf-rfw3

## What is CVE-2021-34820?

CVE-2021-34820 is a high-severity path traversal vulnerability in n/a, published on 19 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Web Path Directory Traversal in the Novus HTTP Server. The Novus HTTP Server is affected by the Directory Traversal for Arbitrary File Access vulnerability. A remote, unauthenticated attacker using an HTTP GET request may be able to exploit this issue to access sensitive data. The issue was discovered in the NMS (Novus Management System) software through 1.51.2

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2021-34820?

It affects 1 product.


Products: Aat Novus Management System.

## How do I fix CVE-2021-34820?

No fix has been published for CVE-2021-34820 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34820 being exploited?

There is no known exploitation of CVE-2021-34820 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-34821](https://insights.sbomify.com/CVE-2021-34821/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34820 and fix it if it is affected.

What it is: CVE-2021-34820 is a high-severity path traversal vulnerability in n/a, published on 19 Jul 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-2021-34820 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-2021-34820/ (Markdown: https://insights.sbomify.com/CVE-2021-34820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34820
- OSV: https://osv.dev/vulnerability/CVE-2021-34820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34820/
Summaries are generated and may contain mistakes; the official description above is the record.