# CVE-2024-20271: Denial of service in Cisco Aironet Access Point Software

> Unauthenticated remote attackers can cause Cisco Access Points to reload unexpectedly by sending crafted IPv4 packets, resulting in a denial of service.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-ff9x-f52m-hw5m

## What is CVE-2024-20271?

CVE-2024-20271 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 27 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the IP packet processing of Cisco Access Point (AP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

 This vulnerability is due to insufficient input validation of certain IPv4 packets. An attacker could exploit this vulnerability by sending a crafted IPv4 packet either to or through an affected device. A successful exploit could allow the attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition. To successfully exploit this vulnerability, the attacker does not need to be associated with the affected AP. This vulnerability cannot be exploited by sending IPv6 packets.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-20271?

It affects 3 products.


Products: Cisco Business Access Points, Cisco Ios Xe, Cisco Wireless Lan Controller Software.

## How do I fix CVE-2024-20271?

No fix has been published for CVE-2024-20271 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20271 being exploited?

There is no known exploitation of CVE-2024-20271 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20271 and fix it if it is affected.

What it is: CVE-2024-20271 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 27 Mar 2024. 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-2024-20271 in the wild and no public exploit code.

Affected product: Cisco Ios Xe. 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-2024-20271/ (Markdown: https://insights.sbomify.com/CVE-2024-20271/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20271
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20271
- OSV: https://osv.dev/vulnerability/CVE-2024-20271

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20271/
Summaries are generated and may contain mistakes; the official description above is the record.