# CVE-2018-19021: Auth bypass in Emerson DeltaV

> Attackers can bypass maintenance port authentication in Emerson DeltaV DCS to cause denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jan 2019
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-qpcc-rcr6-2cj9

## What is CVE-2018-19021?

CVE-2018-19021 is a medium-severity authentication bypass vulnerability in Emerson DeltaV, published on 25 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A specially crafted script could bypass the authentication of a maintenance port of Emerson DeltaV DCS Versions 11.3.1, 11.3.2, 12.3.1, 13.3.1, 14.3, R5.1, R6 and prior, which may allow an attacker to cause a denial of service.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2018-19021?

It affects 1 product.


Products: Emerson Deltav.

## How do I fix CVE-2018-19021?

No fix has been published for CVE-2018-19021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-19021 being exploited?

There is no known exploitation of CVE-2018-19021 in the wild and no public exploit code.

## Other vulnerabilities in Emerson DeltaV

- [CVE-2018-14793](https://insights.sbomify.com/CVE-2018-14793/): Memory corruption in DeltaV (high 8.8)
- [CVE-2018-14795](https://insights.sbomify.com/CVE-2018-14795/): Path traversal in DeltaV (high 8.8)
- [CVE-2021-44463](https://insights.sbomify.com/CVE-2021-44463/): Emerson DeltaV Uncontrolled Search Path Element (high 8.1)
- [CVE-2018-14791](https://insights.sbomify.com/CVE-2018-14791/): Privilege escalation in DeltaV DCS (high 7.8)
- [CVE-2018-14797](https://insights.sbomify.com/CVE-2018-14797/): Other in DeltaV DCS (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19021 and fix it if it is affected.

What it is: CVE-2018-19021 is a medium-severity authentication bypass vulnerability in Emerson DeltaV, published on 25 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-19021 in the wild and no public exploit code.

Affected product: Emerson DeltaV. 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-2018-19021/ (Markdown: https://insights.sbomify.com/CVE-2018-19021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19021
- OSV: https://osv.dev/vulnerability/CVE-2018-19021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-19021/
Summaries are generated and may contain mistakes; the official description above is the record.