# CVE-2023-52891: Denial of service in SIMATIC Energy Manager Basic

> Attackers can cause high load and memory exhaustion in Siemens OPC UA servers, blocking service availability.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 9 Jul 2024
- **Updated:** 27 Aug 2025
- **Also known as:** GHSA-gccj-rgh5-5x96

## What is CVE-2023-52891?

CVE-2023-52891 is a medium-severity denial of service vulnerability in Siemens SIMATIC Energy Manager Basic, published on 9 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in SIMATIC Energy Manager Basic (All versions < V7.5), SIMATIC Energy Manager PRO (All versions < V7.5), SIMATIC IPC DiagBase (All versions), SIMATIC IPC DiagMonitor (All versions), SIMIT V10 (All versions), SIMIT V11 (All versions < V11.1). Unified Automation .NET based OPC UA Server SDK before 3.2.2 used in Siemens products are affected by a similar vulnerability as documented in CVE-2023-27321 for the OPC Foundation UA .NET Standard implementation. A successful attack may lead to high load situation and memory exhaustion, and may block the server.

Weakness: CWE-1325 (Improperly Controlled Sequential Memory Allocation)

## Which versions are affected by CVE-2023-52891?


## How do I fix CVE-2023-52891?

No fix has been published for CVE-2023-52891 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-52891 being exploited?

There is no known exploitation of CVE-2023-52891 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-52891 and fix it if it is affected.

What it is: CVE-2023-52891 is a medium-severity denial of service vulnerability in Siemens SIMATIC Energy Manager Basic, published on 9 Jul 2024. 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-2023-52891 in the wild and no public exploit code.

Affected product: Siemens SIMATIC Energy Manager Basic. 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-2023-52891/ (Markdown: https://insights.sbomify.com/CVE-2023-52891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-52891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-52891
- OSV: https://osv.dev/vulnerability/CVE-2023-52891

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-52891/
Summaries are generated and may contain mistakes; the official description above is the record.