# CVE-2024-34244: Memory corruption in n/a

> A buffer overflow in libmodbus allows attackers to cause crashes or unintended behavior via crafted input to the modbus_write_bits function.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 May 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-crpf-8hgm-99cp, JLSEC-2026-1253, UBUNTU-CVE-2024-34244

## What is CVE-2024-34244?

CVE-2024-34244 is a high-severity memory corruption vulnerability in n/a, published on 8 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

libmodbus v3.1.10 is vulnerable to Buffer Overflow via the modbus_write_bits function. This issue can be triggered when the function is fed with specially crafted input, which leads to out-of-bounds read and can potentially cause a crash or other unintended behaviors.

Weakness: CWE-125 (Out-of-bounds Read), CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2024-34244?

It affects 1 product.


Products: Libmodbus Libmodbus.

## How do I fix CVE-2024-34244?

Upgrade to a fixed version.

## Is CVE-2024-34244 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-34244 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-2024-10918](https://insights.sbomify.com/CVE-2024-10918/): Stack-based Buffer Overflow in libmodbus library (medium 4.8)
- [CVE-2024-36845](https://insights.sbomify.com/CVE-2024-36845/): Denial of service in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-34244 and fix it if it is affected.

What it is: CVE-2024-34244 is a high-severity memory corruption vulnerability in n/a, published on 8 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-34244 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-2024-34244/ (Markdown: https://insights.sbomify.com/CVE-2024-34244/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-34244
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-34244
- OSV: https://osv.dev/vulnerability/CVE-2024-34244

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-34244/
Summaries are generated and may contain mistakes; the official description above is the record.