# CVE-2024-4009: Replay Attack in KNX Secure Devices

> Attackers can capture and replay KNX telegrams to manipulate building automation systems, affecting ABB and Busch-Jaeger devices.

- **Severity:** High 7.3 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/S:N/AU:N/V:D/RE:M/U:Green`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Jun 2024
- **Updated:** 27 Mar 2025
- **Also known as:** GHSA-48fj-hh68-6w6q

## What is CVE-2024-4009?

CVE-2024-4009 is a high-severity vulnerability in ABB, Busch-Jaeger 2,4'' Display 70, SD-U12-70-1-4015, published on 5 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Replay Attack

in ABB, Busch-Jaeger, FTS Display (version 1.00) and BCU (version 1.3.0.33) allows attacker to capture/replay KNX telegram to local KNX Bus-System

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2024-4009?

It affects 5 products.


Products: Abb 2tma310010b0001 Firmware, Abb 2tma310010b0003 Firmware, Abb 2tma310011b0001 Firmware, Abb 2tma310011b0002 Firmware, Abb 2tma310011b0003 Firmware.

## How do I fix CVE-2024-4009?

No fix has been published for CVE-2024-4009 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-4009 being exploited?

There is no known exploitation of CVE-2024-4009 in the wild and no public exploit code.

## Other vulnerabilities in ABB, Busch-Jaeger 2,4'' Display 70, SD-U12-70-1-4015

- [CVE-2024-4008](https://insights.sbomify.com/CVE-2024-4008/): FDSK Leak in KNX Secure Devices (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-4009 and fix it if it is affected.

What it is: CVE-2024-4009 is a high-severity vulnerability in ABB, Busch-Jaeger 2,4'' Display 70, SD-U12-70-1-4015, published on 5 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-4009 in the wild and no public exploit code.

Affected product: ABB, Busch-Jaeger 2,4'' Display 70, SD-U12-70-1-4015. 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-2024-4009/ (Markdown: https://insights.sbomify.com/CVE-2024-4009/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-4009
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-4009
- OSV: https://osv.dev/vulnerability/CVE-2024-4009

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-4009/
Summaries are generated and may contain mistakes; the official description above is the record.