# CVE-2023-43504: Memory corruption in COMOS

> An attacker can execute arbitrary code or cause denial of service via a buffer overflow in the Ptmcast executable of Siemens COMOS.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Nov 2023
- **Updated:** 8 Jan 2025
- **Also known as:** GHSA-339q-f866-3fx6

## What is CVE-2023-43504?

CVE-2023-43504 is a critical memory corruption vulnerability in Siemens COMOS, published on 14 Nov 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been identified in COMOS (All versions < V10.4.4). Ptmcast executable used for testing cache validation service in affected application is vulnerable to Structured Exception Handler (SEH) based buffer overflow. This could allow an attacker to execute arbitrary code on the target system or cause denial of service condition.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-43504?

It affects 1 product.


Products: Siemens Comos.

## How do I fix CVE-2023-43504?

No fix has been published for CVE-2023-43504 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43504 being exploited?

There is no known exploitation of CVE-2023-43504 in the wild and no public exploit code.

## Other vulnerabilities in Siemens COMOS

- [CVE-2023-24482](https://insights.sbomify.com/CVE-2023-24482/): Memory corruption in COMOS V10.2 (critical 10.0)
- [CVE-2023-43505](https://insights.sbomify.com/CVE-2023-43505/): Missing authorization in COMOS (critical 9.6)
- [CVE-2023-46601](https://insights.sbomify.com/CVE-2023-46601/): Missing authorization in COMOS (critical 9.6)
- [CVE-2021-37197](https://insights.sbomify.com/CVE-2021-37197/): SQL injection in COMOS V10.2 (high 8.8)
- [CVE-2021-37198](https://insights.sbomify.com/CVE-2021-37198/): Cross-site request forgery in COMOS V10.2 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43504 and fix it if it is affected.

What it is: CVE-2023-43504 is a critical memory corruption vulnerability in Siemens COMOS, published on 14 Nov 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-43504 in the wild and no public exploit code.

Affected product: Siemens COMOS. 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-2023-43504/ (Markdown: https://insights.sbomify.com/CVE-2023-43504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43504
- OSV: https://osv.dev/vulnerability/CVE-2023-43504

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43504/
Summaries are generated and may contain mistakes; the official description above is the record.