# CVE-2006-0340: Denial of service in n/a

> Remote attackers on the local network can cause a denial of service in Cisco IOS devices via crafted UDP packets when SGBP is enabled.

- **Severity:** High 7.1 (`AV:N/AC:M/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Jan 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-7fvm-59m5-23qm

## What is CVE-2006-0340?

CVE-2006-0340 is a high-severity denial of service vulnerability in Cisco Ios, published on 21 Jan 2006. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Unspecified vulnerability in Stack Group Bidding Protocol (SGBP) support in Cisco IOS 12.0 through 12.4 running on various Cisco products, when SGBP is enabled, allows remote attackers on the local network to cause a denial of service (device hang and network traffic loss) via a crafted UDP packet to port 9900.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2006-0340?

It affects 1 product.


Products: Cisco Ios.

## How do I fix CVE-2006-0340?

No fix has been published for CVE-2006-0340 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-0340 being exploited?

There is no known exploitation of CVE-2006-0340 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-0340 and fix it if it is affected.

What it is: CVE-2006-0340 is a high-severity denial of service vulnerability in Cisco Ios, published on 21 Jan 2006. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2006-0340 in the wild and no public exploit code.

Affected product: Cisco Ios. 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-2006-0340/ (Markdown: https://insights.sbomify.com/CVE-2006-0340/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-0340
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-0340
- OSV: https://osv.dev/vulnerability/CVE-2006-0340

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-0340/
Summaries are generated and may contain mistakes; the official description above is the record.