# CVE-2023-3107: Remote denial of service in IPv6 fragment reassembly

> Remote attackers can cause a kernel panic and denial of service in FreeBSD by sending crafted IPv6 packets that trigger an integer overflow.

- **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:** No
- **Published:** 1 Aug 2023
- **Updated:** 9 Jul 2025
- **Also known as:** GHSA-cx46-mm2w-4mwv

## What is CVE-2023-3107?

CVE-2023-3107 is a high-severity vulnerability in Freebsd Freebsd, published on 1 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2023-3107?

It affects 2 products.


Products: Freebsd Freebsd, Netapp Clustered Data Ontap.

## How do I fix CVE-2023-3107?

No fix has been published for CVE-2023-3107 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3107 being exploited?

There is no known exploitation of CVE-2023-3107 in the wild and no public exploit code.

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3107 and fix it if it is affected.

What it is: CVE-2023-3107 is a high-severity vulnerability in Freebsd Freebsd, published on 1 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-3107 in the wild and no public exploit code.

Affected product: Freebsd Freebsd. 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-2023-3107/ (Markdown: https://insights.sbomify.com/CVE-2023-3107/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3107
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3107
- OSV: https://osv.dev/vulnerability/CVE-2023-3107

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3107/
Summaries are generated and may contain mistakes; the official description above is the record.