# CVE-2018-0395: Cisco FXOS and NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability

> An unauthenticated adjacent attacker can cause a denial of service by sending a crafted LLDP packet to Cisco network devices, triggering an unexpected reload.

- **Severity:** High 8.8 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 17 Oct 2018
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-3wmx-fc2q-p8g5

## What is CVE-2018-0395?

CVE-2018-0395 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 17 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 Link Layer Discovery Protocol (LLDP) implementation for Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition when the device unexpectedly reloads. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface on the targeted device. A successful exploit could allow the attacker to cause the switch to reload unexpectedly.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-0395?

It affects 2 products.


Products: Cisco Firepower Extensible Operating System, Cisco Nx-Os.

## How do I fix CVE-2018-0395?

No fix has been published for CVE-2018-0395 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0395 being exploited?

There is no known exploitation of CVE-2018-0395 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Firepower Extensible Operating System

- [CVE-2018-0310](https://insights.sbomify.com/CVE-2018-0310/): Information disclosure in Cisco FXOS and NX-OS unknown (critical 9.8)
- [CVE-2015-6435](https://insights.sbomify.com/CVE-2015-6435/): Command injection in n/a (critical 9.8)
- [CVE-2021-1368](https://insights.sbomify.com/CVE-2021-1368/): Memory corruption in Cisco NX-OS Software (high 8.8)
- [CVE-2020-3456](https://insights.sbomify.com/CVE-2020-3456/): Cisco FXOS Software Firepower Chassis Manager Cross-Site Request Forgery Vulnerability (high 8.8)
- [CVE-2020-3172](https://insights.sbomify.com/CVE-2020-3172/): Cisco FXOS and NX-OS Software Cisco Discovery Protocol Arbitrary Code Execution and Denial of Service Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0395 and fix it if it is affected.

What it is: CVE-2018-0395 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 17 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-2018-0395 in the wild and no public exploit code.

Affected product: Cisco Firepower Extensible Operating System. 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-2018-0395/ (Markdown: https://insights.sbomify.com/CVE-2018-0395/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0395
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0395
- OSV: https://osv.dev/vulnerability/CVE-2018-0395

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-0395/
Summaries are generated and may contain mistakes; the official description above is the record.