# CVE-2005-4257: Denial of service in n/a

> Remote attackers can crash Linksys routers by sending malformed IP packets with identical source and destination addresses.

- **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:** 15 Dec 2005
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-72fv-wfpw-6q2x

## What is CVE-2005-4257?

CVE-2005-4257 is a high-severity denial of service vulnerability in n/a, published on 15 Dec 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Linksys WRT54GS and BEFW11S4 allows remote attackers to cause a denial of service (device crash) via an IP packet with the same source and destination IPs and ports, and with the SYN flag set (aka LAND). NOTE: the provenance of this issue is unknown; the details are obtained solely from the BID.

## Which versions are affected by CVE-2005-4257?

It affects 4 products.


Products: Linksys Befw11s4, Linksys Befw11s4 V3, Linksys Befw11s4 V4, Linksys Wrt54gs.

## How do I fix CVE-2005-4257?

No fix has been published for CVE-2005-4257 yet. Limit exposure of the affected software until one is available.

## Is CVE-2005-4257 being exploited?

There is no known exploitation of CVE-2005-4257 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2005-4257 and fix it if it is affected.

What it is: CVE-2005-4257 is a high-severity denial of service vulnerability in n/a, published on 15 Dec 2005. 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-2005-4257 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-2005-4257/ (Markdown: https://insights.sbomify.com/CVE-2005-4257/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2005-4257
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2005-4257
- OSV: https://osv.dev/vulnerability/CVE-2005-4257

---
From sbomify Insights: https://insights.sbomify.com/CVE-2005-4257/
Summaries are generated and may contain mistakes; the official description above is the record.