# CVE-2019-6550: Memory corruption in WebAccess/SCADA

> Remote attackers can execute arbitrary code on Advantech WebAccess/SCADA systems via stack-based buffer overflows caused by improper input validation.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Apr 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-m53j-r3hw-w76p

## What is CVE-2019-6550?

CVE-2019-6550 is a critical memory corruption vulnerability in Advantech Webaccess, published on 5 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Advantech WebAccess/SCADA, Versions 8.3.5 and prior. Multiple stack-based buffer overflow vulnerabilities, caused by a lack of proper validation of the length of user-supplied data, may allow remote code execution.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2019-6550?

It affects 1 product.


Products: Advantech Webaccess.

## How do I fix CVE-2019-6550?

No fix has been published for CVE-2019-6550 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6550 being exploited?

There is no known exploitation of CVE-2019-6550 in the wild and no public exploit code.

## Other vulnerabilities in Advantech Webaccess

- [CVE-2014-9208](https://insights.sbomify.com/CVE-2014-9208/): Multiple stack-based buffer overflows in unspecified DLL files in Advantech WebAccess before 8.0.1 allow remote attackers to execute arbitra (critical 10.0)
- [CVE-2021-33023](https://insights.sbomify.com/CVE-2021-33023/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38389](https://insights.sbomify.com/CVE-2021-38389/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38408](https://insights.sbomify.com/CVE-2021-38408/): Memory corruption in Advantech WebAccess (critical 9.8)
- [CVE-2020-12019](https://insights.sbomify.com/CVE-2020-12019/): Memory corruption in WebAccess Node (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6550 and fix it if it is affected.

What it is: CVE-2019-6550 is a critical memory corruption vulnerability in Advantech Webaccess, published on 5 Apr 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-2019-6550 in the wild and no public exploit code.

Affected product: Advantech Webaccess. 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-2019-6550/ (Markdown: https://insights.sbomify.com/CVE-2019-6550/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6550
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6550
- OSV: https://osv.dev/vulnerability/CVE-2019-6550

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6550/
Summaries are generated and may contain mistakes; the official description above is the record.