# CVE-2018-0480: Cisco IOS XE Software Errdisable Denial of Service Vulnerability

> An unauthenticated adjacent attacker can crash Cisco IOS XE devices by triggering a race condition in the errdisable per VLAN feature, causing denial of service.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:A/AC:H/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:** 5 Oct 2018
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-2q4r-gmc8-6577

## What is CVE-2018-0480?

CVE-2018-0480 is a medium-severity vulnerability in Cisco Ios Xe, published on 5 Oct 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the errdisable per VLAN feature of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause the device to crash, leading to a denial of service (DoS) condition. The vulnerability is due to a race condition that occurs when the VLAN and port enter an errdisabled state, resulting in an incorrect state in the software. An attacker could exploit this vulnerability by sending frames that trigger the errdisable condition. A successful exploit could allow the attacker to cause the affected device to crash, leading to a DoS condition.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2018-0480?

It affects 1 product.


Products: Cisco Ios Xe.

## How do I fix CVE-2018-0480?

No fix has been published for CVE-2018-0480 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0480 being exploited?

There is no known exploitation of CVE-2018-0480 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xe

- [CVE-2023-20198](https://insights.sbomify.com/CVE-2023-20198/): Cisco IOS XE Web UI Privilege Escalation (critical 10.0, exploited in the wild)
- [CVE-2018-0151](https://insights.sbomify.com/CVE-2018-0151/): Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2023-20273](https://insights.sbomify.com/CVE-2023-20273/): Cisco IOS XE Web UI Command Injection (high 7.2, exploited in the wild)
- [CVE-2025-20188](https://insights.sbomify.com/CVE-2025-20188/): Hardcoded credentials in Cisco IOS XE Software (critical 10.0)
- [CVE-2021-34770](https://insights.sbomify.com/CVE-2021-34770/): Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0480 and fix it if it is affected.

What it is: CVE-2018-0480 is a medium-severity vulnerability in Cisco Ios Xe, published on 5 Oct 2018. 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-2018-0480 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-2018-0480/ (Markdown: https://insights.sbomify.com/CVE-2018-0480/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0480
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0480
- OSV: https://osv.dev/vulnerability/CVE-2018-0480

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0480/
Summaries are generated and may contain mistakes; the official description above is the record.