# CVE-2024-36845: Denial of service in n/a

> Attackers can cause a Denial of Service in applications using libmodbus by sending crafted messages to the unit-test-server.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 May 2024
- **Updated:** 3 Nov 2025
- **Also known as:** DEBIAN-CVE-2024-36845, GHSA-vqrf-777q-wcmm, JLSEC-2026-1256, UBUNTU-CVE-2024-36845

## What is CVE-2024-36845?

CVE-2024-36845 is a medium-severity denial of service vulnerability in n/a, published on 31 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An invalid pointer in the modbus_receive() function of libmodbus v3.1.6 allows attackers to cause a Denial of Service (DoS) via a crafted message sent to the unit-test-server.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2024-36845?

It affects 1 product.


Products: Libmodbus Libmodbus.

## How do I fix CVE-2024-36845?

Upgrade to a fixed version.

## Is CVE-2024-36845 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-36845 exists.

## Other vulnerabilities in n/a

- [CVE-2023-26793](https://insights.sbomify.com/CVE-2023-26793/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-36843](https://insights.sbomify.com/CVE-2024-36843/): Memory corruption in n/a (high 7.5)
- [CVE-2024-36844](https://insights.sbomify.com/CVE-2024-36844/): Use after free in n/a (high 7.5)
- [CVE-2024-34244](https://insights.sbomify.com/CVE-2024-34244/): Memory corruption in n/a (high 7.5)
- [CVE-2024-10918](https://insights.sbomify.com/CVE-2024-10918/): Stack-based Buffer Overflow in libmodbus library (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-36845 and fix it if it is affected.

What it is: CVE-2024-36845 is a medium-severity denial of service vulnerability in n/a, published on 31 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-36845 exists.

Affected product: n/a. 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-2024-36845/ (Markdown: https://insights.sbomify.com/CVE-2024-36845/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-36845
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-36845
- OSV: https://osv.dev/vulnerability/CVE-2024-36845

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-36845/
Summaries are generated and may contain mistakes; the official description above is the record.