# CVE-2023-28831: Integer overflow in SIMATIC BRAUMAT

> An unauthenticated remote attacker can cause a denial of service in Siemens SIMATIC devices by sending a crafted certificate that triggers an infinite loop during validation.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Sep 2023
- **Updated:** 11 Nov 2025
- **Also known as:** GHSA-p7vc-4gr6-g2px

## What is CVE-2023-28831?

CVE-2023-28831 is a high-severity vulnerability in Siemens SIMATIC BRAUMAT, published on 12 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application to run into an infinite loop during certificate validation.

This could allow an unauthenticated remote attacker to create a denial of service condition by sending a specially crafted certificate.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2023-28831?

It affects 78 products.


Products: Siemens Simatic Cloud Connect 7 Cc712 Firmware, Siemens Simatic Cloud Connect 7 Cc716 Firmware, Siemens Simatic Drive Controller Cpu 1504d Tf Firmware, Siemens Simatic Drive Controller Cpu 1507d Tf Firmware, Siemens Simatic Et 200sp Open Controller Cpu Firmware, Siemens Simatic S7-1200 Cpu Firmware, Siemens Simatic S7-1500 Cpu 1510sp-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1510sp F-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1511-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1511c-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1511f-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1511t-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1511tf-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1512c-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1512sp-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1512sp F-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1513-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1513f-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1513r-1 Pn Firmware, Siemens Simatic S7-1500 Cpu 1514sp-2 Pn Firmware and 58 more.

## How do I fix CVE-2023-28831?

No fix has been published for CVE-2023-28831 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-28831 being exploited?

There is no known exploitation of CVE-2023-28831 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-28831 and fix it if it is affected.

What it is: CVE-2023-28831 is a high-severity vulnerability in Siemens SIMATIC BRAUMAT, published on 12 Sep 2023. 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-2023-28831 in the wild and no public exploit code.

Affected product: Siemens SIMATIC BRAUMAT. 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-2023-28831/ (Markdown: https://insights.sbomify.com/CVE-2023-28831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28831
- OSV: https://osv.dev/vulnerability/CVE-2023-28831

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-28831/
Summaries are generated and may contain mistakes; the official description above is the record.