# CVE-2009-0687: Null dereference in n/a

> Remote attackers can cause a system panic and denial of service in OpenBSD PF via crafted IP packets triggering a NULL pointer dereference.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-r7qv-r86r-qrqf

## What is CVE-2009-0687?

CVE-2009-0687 is a high-severity vulnerability in Netbsd Netbsd, published on 11 Aug 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The pf_test_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through 4.5, NetBSD 5.0 before RC3, MirOS 10 and earlier, and MidnightBSD 0.3-current allows remote attackers to cause a denial of service (panic) via crafted IP packets that trigger a NULL pointer dereference during translation, related to an IPv4 packet with an ICMPv6 payload.

Weakness: CWE-399

## Which versions are affected by CVE-2009-0687?

It affects 4 products.


Products: Midnightbsd Midnightbsd, Mirbsd Miros, Netbsd Netbsd, Openbsd Openbsd.

## How do I fix CVE-2009-0687?

No fix has been published for CVE-2009-0687 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-0687 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-0687 exists.

Public exploit code:

- OpenBSD 4.5 - IP datagrams Remote Denial of Service (exploitdb)
- OpenBSD 4.5 - IP datagram Null Pointer Deref Denial of Service (exploitdb)
- Multiple Vendor - PF Null Pointer Dereference (exploitdb)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-0687 and fix it if it is affected.

What it is: CVE-2009-0687 is a high-severity vulnerability in Netbsd Netbsd, published on 11 Aug 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-0687 exists.

Affected product: Netbsd Netbsd. 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-2009-0687/ (Markdown: https://insights.sbomify.com/CVE-2009-0687/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-0687
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-0687
- OSV: https://osv.dev/vulnerability/CVE-2009-0687

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-0687/
Summaries are generated and may contain mistakes; the official description above is the record.