# CVE-2007-4430: Denial of service in n/a

> Attackers can cause device restarts and BGP table rebuilds via crafted regex in show commands, requiring anonymous telnet or Looking Glass access.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Aug 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-xw39-hmhj-f95j

## What is CVE-2007-4430?

CVE-2007-4430 is a medium-severity denial of service vulnerability in Cisco Ios, published on 20 Aug 2007. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Unspecified vulnerability in Cisco IOS 12.0 through 12.4 allows context-dependent attackers to cause a denial of service (device restart and BGP routing table rebuild) via certain regular expressions in a "show ip bgp regexp" command.  NOTE: unauthenticated remote attacks are possible in environments with anonymous telnet and Looking Glass access.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2007-4430?

It affects 5 products.


Products: Cisco Cbos, Cisco Cli, Cisco Ids, Cisco Ios, Cisco Ios Xr.

## How do I fix CVE-2007-4430?

No fix has been published for CVE-2007-4430 yet. Limit exposure of the affected software until one is available.

## Is CVE-2007-4430 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-4430 exists.

Public exploit code:

- Cisco IOS 12.3 - Show IP BGP Regexp Remote Denial of Service (exploitdb)

## Other vulnerabilities in Cisco Ios

- [CVE-2001-0751](https://insights.sbomify.com/CVE-2001-0751/): Other in n/a (high 7.5)
- [CVE-2001-0753](https://insights.sbomify.com/CVE-2001-0753/): Information disclosure in n/a (high 7.5)
- [CVE-2002-0886](https://insights.sbomify.com/CVE-2002-0886/): Denial of service in n/a (medium 5.0)
- [CVE-2001-0752](https://insights.sbomify.com/CVE-2001-0752/): Denial of service in n/a (medium 5.0)
- [CVE-2001-0754](https://insights.sbomify.com/CVE-2001-0754/): Denial of service in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4430 and fix it if it is affected.

What it is: CVE-2007-4430 is a medium-severity denial of service vulnerability in Cisco Ios, published on 20 Aug 2007. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-4430 exists.

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-2007-4430/ (Markdown: https://insights.sbomify.com/CVE-2007-4430/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4430
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4430
- OSV: https://osv.dev/vulnerability/CVE-2007-4430

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4430/
Summaries are generated and may contain mistakes; the official description above is the record.