# CVE-2020-27254: Auth bypass in Emerson Rosemount X-STREAM Gas Analyzer

> An attacker can access sensitive log and backup data via a crafted URL due to improper authentication in Emerson Rosemount X-STREAM Gas Analyzers.

- **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:** 21 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-3qjx-hh6f-4fvq

## What is CVE-2020-27254?

CVE-2020-27254 is a high-severity authentication bypass vulnerability in Emerson Rosemount X-STREAM Gas Analyzer, published on 21 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Emerson Rosemount X-STREAM Gas AnalyzerX-STREAM enhanced XEGP, XEGK, XEFD, XEXF – all revisions, The affected products are vulnerable to improper authentication for accessing log and backup data, which could allow an attacker with a specially crafted URL to obtain access to sensitive information.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2020-27254?

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-2020-27254?

No fix has been published for CVE-2020-27254 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27254 being exploited?

There is no known exploitation of CVE-2020-27254 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-2021-27461](https://insights.sbomify.com/CVE-2021-27461/): Path traversal 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-2020-27254 and fix it if it is affected.

What it is: CVE-2020-27254 is a high-severity authentication bypass vulnerability in Emerson Rosemount X-STREAM Gas Analyzer, published on 21 Dec 2020. 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-2020-27254 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-2020-27254/ (Markdown: https://insights.sbomify.com/CVE-2020-27254/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27254
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27254
- OSV: https://osv.dev/vulnerability/CVE-2020-27254

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-27254/
Summaries are generated and may contain mistakes; the official description above is the record.