# CVE-2018-18999: Memory corruption in WebAccess/SCADA

> A buffer overflow in WebAccess/SCADA allows attackers to execute arbitrary code or cause denial of service via improper input validation.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 19 Dec 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-q9q3-g4f5-x6g7

## What is CVE-2018-18999?

CVE-2018-18999 is a high-severity memory corruption vulnerability in WebAccess/SCADA, published on 19 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WebAccess/SCADA, WebAccess/SCADA Version 8.3.2 installed on Windows 2008 R2 SP1. Lack of proper validation of user supplied input may allow an attacker to cause the overflow of a buffer on the stack.

Weakness: CWE-787 (Out-of-bounds Write), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-18999?

It affects 1 product.


Products: Advantech Webaccess\/Scada.

## How do I fix CVE-2018-18999?

No fix has been published for CVE-2018-18999 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18999 being exploited?

There is no known exploitation of CVE-2018-18999 in the wild and no public exploit code.

## Other vulnerabilities in WebAccess/SCADA

- [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-2018-18999 and fix it if it is affected.

What it is: CVE-2018-18999 is a high-severity memory corruption vulnerability in WebAccess/SCADA, published on 19 Dec 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-2018-18999 in the wild and no public exploit code.

Affected product: WebAccess/SCADA. 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-2018-18999/ (Markdown: https://insights.sbomify.com/CVE-2018-18999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18999
- OSV: https://osv.dev/vulnerability/CVE-2018-18999

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18999/
Summaries are generated and may contain mistakes; the official description above is the record.