# CVE-2007-5031: Null dereference in n/a

> Remote attackers can crash the Dibbler DHCPv6 server by sending a malformed REBIND message, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Sep 2007
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-5031, GHSA-25mw-r645-vhvc

## What is CVE-2007-5031?

CVE-2007-5031 is a medium-severity vulnerability in n/a, published on 21 Sep 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The TSrvOptIA_NA::rebind method in SrvOptions/SrvOptIA_NA.cpp in Dibbler 0.6.0 allows remote attackers to cause a denial of service (NULL dereference and daemon crash) via an invalid IA_NA option in a REBIND message.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2007-5031?

It affects 1 product.


Products: Dibbler Dibbler.

## How do I fix CVE-2007-5031?

Upgrade to a fixed version.

## Is CVE-2007-5031 being exploited?

There is no known exploitation of CVE-2007-5031 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2007-5028](https://insights.sbomify.com/CVE-2007-5028/): Misconfiguration in n/a (high 7.5)
- [CVE-2007-5029](https://insights.sbomify.com/CVE-2007-5029/): Denial of service in n/a (medium 5.0)
- [CVE-2007-5030](https://insights.sbomify.com/CVE-2007-5030/): Integer overflow in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-5031 and fix it if it is affected.

What it is: CVE-2007-5031 is a medium-severity vulnerability in n/a, published on 21 Sep 2007. 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-2007-5031 in the wild and no public exploit code.

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-2007-5031/ (Markdown: https://insights.sbomify.com/CVE-2007-5031/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-5031
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-5031
- OSV: https://osv.dev/vulnerability/CVE-2007-5031

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-5031/
Summaries are generated and may contain mistakes; the official description above is the record.