# CVE-2017-6025: Memory corruption in 3S-Smart Software Solutions GmbH CODESYS Web Server

> A stack buffer overflow in CODESYS Web Server allows attackers to execute arbitrary code or crash the application via malicious XML input.

- **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:** 19 May 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-86wq-qm2r-82w8

## What is CVE-2017-6025?

CVE-2017-6025 is a critical memory corruption vulnerability in 3S-Smart Software Solutions GmbH CODESYS Web Server, published on 19 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Stack Buffer Overflow issue was discovered in 3S-Smart Software Solutions GmbH CODESYS Web Server. The following versions of CODESYS Web Server, part of the CODESYS WebVisu web browser visualization software, are affected: CODESYS Web Server Versions 2.3 and prior. A malicious user could overflow the stack buffer by providing overly long strings to functions that handle the XML. Because the function does not verify string size before copying to memory, the attacker may then be able to crash the application or run arbitrary code.

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-2017-6025?

It affects 1 product.


Products: Codesys Web Server.

## How do I fix CVE-2017-6025?

No fix has been published for CVE-2017-6025 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-6025 being exploited?

There is no known exploitation of CVE-2017-6025 in the wild and no public exploit code.

## Other vulnerabilities in 3S-Smart Software Solutions GmbH CODESYS Web Server

- [CVE-2017-6027](https://insights.sbomify.com/CVE-2017-6027/): File upload in 3S-Smart Software Solutions GmbH CODESYS Web Server (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6025 and fix it if it is affected.

What it is: CVE-2017-6025 is a critical memory corruption vulnerability in 3S-Smart Software Solutions GmbH CODESYS Web Server, published on 19 May 2017. 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-2017-6025 in the wild and no public exploit code.

Affected product: 3S-Smart Software Solutions GmbH CODESYS Web Server. 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-2017-6025/ (Markdown: https://insights.sbomify.com/CVE-2017-6025/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6025
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6025
- OSV: https://osv.dev/vulnerability/CVE-2017-6025

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-6025/
Summaries are generated and may contain mistakes; the official description above is the record.