# CVE-2021-27461: Path traversal in Emerson Rosemount X-STREAM Gas Analyzer

> Attackers can access stored data on Emerson Rosemount X-STREAM Gas Analyzers by using specially crafted URLs due to a path traversal vulnerability.

- **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:** 20 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-3p4j-j4x8-76j4

## What is CVE-2021-27461?

CVE-2021-27461 is a high-severity path traversal vulnerability in Emerson Rosemount X-STREAM Gas Analyzer, published on 20 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected webserver applications allow access to stored data that can be obtained by using specially crafted URLs.

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

## Which versions are affected by CVE-2021-27461?

It affects 4 products.


Products: Emerson X-Stream Enhanced Xefd Firmware, Emerson X-Stream Enhanced Xegk Firmware, Emerson X-Stream Enhanced Xegp Firmware, Emerson X-Stream Enhanced Xexf Firmware.

## How do I fix CVE-2021-27461?

No fix has been published for CVE-2021-27461 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27461 being exploited?

There is no known exploitation of CVE-2021-27461 in the wild and no public exploit code.

## Other vulnerabilities in Emerson Rosemount X-STREAM Gas Analyzer

- [CVE-2021-27459](https://insights.sbomify.com/CVE-2021-27459/): File upload in Emerson Rosemount X-STREAM Gas Analyzer (critical 9.8)
- [CVE-2021-27457](https://insights.sbomify.com/CVE-2021-27457/): Weak cryptography in Emerson Rosemount X-STREAM Gas Analyzer (high 7.5)
- [CVE-2020-27254](https://insights.sbomify.com/CVE-2020-27254/): Auth bypass in Emerson Rosemount X-STREAM Gas Analyzer (high 7.5)
- [CVE-2021-27465](https://insights.sbomify.com/CVE-2021-27465/): Cross-site scripting in Emerson Rosemount X-STREAM Gas Analyzer (medium 6.1)
- [CVE-2021-27467](https://insights.sbomify.com/CVE-2021-27467/): Cross-site request forgery in Emerson Rosemount X-STREAM Gas Analyzer (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27461 and fix it if it is affected.

What it is: CVE-2021-27461 is a high-severity path traversal vulnerability in Emerson Rosemount X-STREAM Gas Analyzer, published on 20 May 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-2021-27461 in the wild and no public exploit code.

Affected product: Emerson Rosemount X-STREAM Gas Analyzer. 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-2021-27461/ (Markdown: https://insights.sbomify.com/CVE-2021-27461/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27461
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27461
- OSV: https://osv.dev/vulnerability/CVE-2021-27461

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27461/
Summaries are generated and may contain mistakes; the official description above is the record.