# CVE-2023-1639: IObit Malware Fighter IOCTL ImfRegistryFilter.sys 0x8001E04C denial of service

> A local attacker can cause a denial of service in IObit Malware Fighter by exploiting a flaw in the ImfRegistryFilter.sys driver.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Mar 2023
- **Updated:** 19 Feb 2025
- **Also known as:** GHSA-46h3-43mp-654j

## What is CVE-2023-1639?

CVE-2023-1639 is a medium-severity denial of service vulnerability in IObit Malware Fighter, published on 26 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability classified as problematic has been found in IObit Malware Fighter 9.4.0.776. This affects the function 0x8001E04C in the library ImfRegistryFilter.sys of the component IOCTL Handler. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-224019.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2023-1639?

It affects 1 product.


Products: Iobit Malware Fighter.

## How do I fix CVE-2023-1639?

No fix has been published for CVE-2023-1639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-1639 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1639 exists.

## Other vulnerabilities in IObit Malware Fighter

- [CVE-2016-20059](https://insights.sbomify.com/CVE-2016-20059/): IObit Malware Fighter 4.3.1 Unquoted Service Path Privilege Escalation (high 8.5)
- [CVE-2020-23864](https://insights.sbomify.com/CVE-2020-23864/): Privilege escalation in n/a (high 7.8)
- [CVE-2018-19084](https://insights.sbomify.com/CVE-2018-19084/): Memory corruption in n/a (high 7.8)
- [CVE-2018-19085](https://insights.sbomify.com/CVE-2018-19085/): Memory corruption in n/a (high 7.8)
- [CVE-2018-19086](https://insights.sbomify.com/CVE-2018-19086/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-1639 and fix it if it is affected.

What it is: CVE-2023-1639 is a medium-severity denial of service vulnerability in IObit Malware Fighter, published on 26 Mar 2023. 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-2023-1639 exists.

Affected product: IObit Malware Fighter. 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-2023-1639/ (Markdown: https://insights.sbomify.com/CVE-2023-1639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1639
- OSV: https://osv.dev/vulnerability/CVE-2023-1639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1639/
Summaries are generated and may contain mistakes; the official description above is the record.