# CVE-2022-43589: Null dereference in CBFS Filter

> A null pointer dereference in CBFS Filter allows attackers to cause denial of service via a crafted I/O request packet.

- **Severity:** Medium 6.2 (`CVSS:3.0/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Nov 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-7q7j-vrxc-wv26

## What is CVE-2022-43589?

CVE-2022-43589 is a medium-severity vulnerability in Callback technologies CBFS Filter, published on 28 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A null pointer dereference vulnerability exists in the handle_ioctl_8314C functionality of Callback technologies CBFS Filter 20.0.8317. A specially crafted I/O request packet (IRP) can lead to denial of service. An attacker can issue an ioctl to trigger this vulnerability.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2022-43589?

It affects 1 product.


Products: Callback Cbfs Filter.

## How do I fix CVE-2022-43589?

No fix has been published for CVE-2022-43589 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43589 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-43589 exists.

## Other vulnerabilities in Callback technologies CBFS Filter

- [CVE-2022-43588](https://insights.sbomify.com/CVE-2022-43588/): Null dereference in CBFS Filter (medium 6.2)
- [CVE-2022-43590](https://insights.sbomify.com/CVE-2022-43590/): Null dereference in CBFS Filter (medium 6.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43589 and fix it if it is affected.

What it is: CVE-2022-43589 is a medium-severity vulnerability in Callback technologies CBFS Filter, published on 28 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-43589 exists.

Affected product: Callback technologies CBFS Filter. 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-2022-43589/ (Markdown: https://insights.sbomify.com/CVE-2022-43589/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43589
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43589
- OSV: https://osv.dev/vulnerability/CVE-2022-43589

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43589/
Summaries are generated and may contain mistakes; the official description above is the record.