# CVE-2024-20318: Denial of service in Cisco IOS XR Software

> An unauthenticated adjacent attacker can cause a denial of service by sending specific Ethernet frames to devices with Layer 2 services enabled.

- **Severity:** High 7.4 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Mar 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-6hgv-w8jj-jm2j

## What is CVE-2024-20318?

CVE-2024-20318 is a high-severity denial of service vulnerability in Cisco IOS XR Software, published on 13 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Layer 2 Ethernet services of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the line card network processor to reset, resulting in a denial of service (DoS) condition.

 This vulnerability is due to the incorrect handling of specific Ethernet frames that are received on line cards that have the Layer 2 services feature enabled. An attacker could exploit this vulnerability by sending specific Ethernet frames through an affected device. A successful exploit could allow the attacker to cause the ingress interface network processor to reset, resulting in a loss of traffic over the interfaces that are supported by the network processor. Multiple resets of the network processor would cause the line card to reset, resulting in a DoS condition.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-20318?


## How do I fix CVE-2024-20318?

No fix has been published for CVE-2024-20318 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20318 being exploited?

There is no known exploitation of CVE-2024-20318 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20318 and fix it if it is affected.

What it is: CVE-2024-20318 is a high-severity denial of service vulnerability in Cisco IOS XR Software, published on 13 Mar 2024. 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-2024-20318 in the wild and no public exploit code.

Affected product: Cisco IOS XR Software. 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-2024-20318/ (Markdown: https://insights.sbomify.com/CVE-2024-20318/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20318
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20318
- OSV: https://osv.dev/vulnerability/CVE-2024-20318

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20318/
Summaries are generated and may contain mistakes; the official description above is the record.