# CVE-2018-6911: Command injection in n/a

> Remote attackers can execute arbitrary OS commands in Advantech WebAccess via the VBWinExec function, posing a critical risk to industrial control systems.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 13 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-r49c-w6f5-7rcw

## What is CVE-2018-6911?

CVE-2018-6911 is a critical command injection vulnerability in Advantech Webaccess, published on 13 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The VBWinExec function in Node\AspVBObj.dll in Advantech WebAccess 8.3.0 allows remote attackers to execute arbitrary OS commands via a single argument (aka the command parameter).

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2018-6911?

It affects 1 product.


Products: Advantech Webaccess.

## How do I fix CVE-2018-6911?

No fix has been published for CVE-2018-6911 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-6911 being exploited?

There is no known exploitation of CVE-2018-6911 in the wild and no public exploit code.

Public exploit code:

- Advantech WebAccess 8.3.0 - Remote Code Execution (exploitdb)

## 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-2018-6911 and fix it if it is affected.

What it is: CVE-2018-6911 is a critical command injection vulnerability in Advantech Webaccess, published on 13 Feb 2018. 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-2018-6911 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-2018-6911/ (Markdown: https://insights.sbomify.com/CVE-2018-6911/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-6911
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-6911
- OSV: https://osv.dev/vulnerability/CVE-2018-6911

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-6911/
Summaries are generated and may contain mistakes; the official description above is the record.