# CVE-2006-3551: Security feature bypass in n/a

> Attackers can bypass firewall restrictions in NCP Secure Enterprise Client to send UDP traffic when specific blocking rules are configured.

- **Severity:** Low 1.2 (`AV:L/AC:H/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jul 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-8gcg-g8ch-xhqg

## What is CVE-2006-3551?

CVE-2006-3551 is a low-severity vulnerability in n/a, published on 13 Jul 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NCP Secure Enterprise Client (aka VPN/PKI client) 8.30 Build 59, and possibly earlier versions, when the Link Firewall and Personal Firewall are both configured to block all inbound and outbound network traffic, allows context-dependent attackers to send inbound UDP traffic with source port 67 and destination port 68, and outbound UDP traffic with source port 68 and destination port 67.

## Which versions are affected by CVE-2006-3551?

It affects 1 product.


Products: Ncp Network Communications Secure Client.

## How do I fix CVE-2006-3551?

No fix has been published for CVE-2006-3551 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-3551 being exploited?

There is no known exploitation of CVE-2006-3551 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2006-0968](https://insights.sbomify.com/CVE-2006-0968/): Code injection in n/a (high 7.2)
- [CVE-2006-0964](https://insights.sbomify.com/CVE-2006-0964/): Security feature bypass in n/a (medium 4.6)
- [CVE-2006-0965](https://insights.sbomify.com/CVE-2006-0965/): Memory corruption in n/a (medium 4.6)
- [CVE-2006-0966](https://insights.sbomify.com/CVE-2006-0966/): Denial of service in n/a (low 2.1)
- [CVE-2006-0967](https://insights.sbomify.com/CVE-2006-0967/): Denial of service in n/a (low 2.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-3551 and fix it if it is affected.

What it is: CVE-2006-3551 is a low-severity vulnerability in n/a, published on 13 Jul 2006. 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-2006-3551 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-2006-3551/ (Markdown: https://insights.sbomify.com/CVE-2006-3551/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-3551
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-3551
- OSV: https://osv.dev/vulnerability/CVE-2006-3551

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-3551/
Summaries are generated and may contain mistakes; the official description above is the record.