# CVE-2019-6521: Auth bypass in n/a

> Attackers can bypass authentication in WebAccess/SCADA to obtain and manipulate sensitive information.

- **Severity:** High 8.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Feb 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v5ff-xr5w-x98p

## What is CVE-2019-6521?

CVE-2019-6521 is a high-severity authentication bypass vulnerability in n/a, published on 5 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WebAccess/SCADA, Version 8.3. Specially crafted requests could allow a possible authentication bypass that could allow an attacker to obtain and manipulate sensitive information.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2019-6521?

It affects 1 product.


Products: Advantech Webaccess\/Scada.

## How do I fix CVE-2019-6521?

No fix has been published for CVE-2019-6521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6521 being exploited?

There is no known exploitation of CVE-2019-6521 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-1437](https://insights.sbomify.com/CVE-2023-1437/): CVE-2023-1437 (critical 9.8)
- [CVE-2021-32943](https://insights.sbomify.com/CVE-2021-32943/): Memory corruption in WebAccess/SCADA (critical 9.8)
- [CVE-2019-6519](https://insights.sbomify.com/CVE-2019-6519/): Auth bypass in n/a (critical 9.8)
- [CVE-2019-6523](https://insights.sbomify.com/CVE-2019-6523/): SQL injection in n/a (critical 9.8)
- [CVE-2021-22669](https://insights.sbomify.com/CVE-2021-22669/): Privilege escalation in Advantech WebAccess/SCADA (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6521 and fix it if it is affected.

What it is: CVE-2019-6521 is a high-severity authentication bypass vulnerability in n/a, published on 5 Feb 2019. 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-2019-6521 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-2019-6521/ (Markdown: https://insights.sbomify.com/CVE-2019-6521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6521
- OSV: https://osv.dev/vulnerability/CVE-2019-6521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6521/
Summaries are generated and may contain mistakes; the official description above is the record.