# CVE-2018-8840: Memory corruption in Schneider Electric InduSoft Web Studio and InTouch Machine Edition

> Remote attackers can achieve code execution in Schneider Electric InduSoft Web Studio and InTouch Machine Edition via crafted packets during tag or alarm actions.

- **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:** 18 Apr 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-794x-w4ff-7p84

## What is CVE-2018-8840?

CVE-2018-8840 is a critical memory corruption vulnerability in ICS-CERT Schneider Electric InduSoft Web Studio and InTouch Machine Edition, published on 18 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A remote attacker could send a carefully crafted packet in InduSoft Web Studio v8.1 and prior versions, and/or InTouch Machine Edition 2017 v8.1 and prior versions during a tag, alarm, or event related action such as read and write, which may allow remote code execution.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2018-8840?

It affects 2 products.


Products: Indusoft Web Studio, Industrial-Software Intouch Machine Edition 2017.

## How do I fix CVE-2018-8840?

No fix has been published for CVE-2018-8840 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8840 being exploited?

There is no known exploitation of CVE-2018-8840 in the wild and no public exploit code.

## Other vulnerabilities in ICS-CERT Schneider Electric InduSoft Web Studio and InTouch Machine Edition

- [CVE-2014-0780](https://insights.sbomify.com/CVE-2014-0780/): InduSoft Web Studio NTWebServer Directory Traversal (high 7.5, exploited in the wild)
- [CVE-2011-4051](https://insights.sbomify.com/CVE-2011-4051/): Auth bypass in n/a (critical 10.0)
- [CVE-2011-0342](https://insights.sbomify.com/CVE-2011-0342/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-1900](https://insights.sbomify.com/CVE-2011-1900/): Path traversal in n/a (critical 10.0)
- [CVE-2011-4052](https://insights.sbomify.com/CVE-2011-4052/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8840 and fix it if it is affected.

What it is: CVE-2018-8840 is a critical memory corruption vulnerability in ICS-CERT Schneider Electric InduSoft Web Studio and InTouch Machine Edition, published on 18 Apr 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-2018-8840 in the wild and no public exploit code.

Affected product: ICS-CERT Schneider Electric InduSoft Web Studio and InTouch Machine Edition. 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-2018-8840/ (Markdown: https://insights.sbomify.com/CVE-2018-8840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8840
- OSV: https://osv.dev/vulnerability/CVE-2018-8840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-8840/
Summaries are generated and may contain mistakes; the official description above is the record.