# CVE-2019-1750: Cisco IOS XE Software Catalyst 4500 Cisco Discovery Protocol Denial of Service Vulnerability

> An unauthenticated adjacent attacker can cause a denial of service on Cisco Catalyst 4500 switches by sending crafted CDP packets.

- **Severity:** High 7.4 (`CVSS:3.0/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:** 27 Mar 2019
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-9rp5-fg3q-frgm

## What is CVE-2019-1750?

CVE-2019-1750 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 27 Mar 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Easy Virtual Switching System (VSS) of Cisco IOS XE Software on Catalyst 4500 Series Switches could allow an unauthenticated, adjacent attacker to cause the switches to reload. The vulnerability is due to incomplete error handling when processing Cisco Discovery Protocol (CDP) packets used with the Easy Virtual Switching System. An attacker could exploit this vulnerability by sending a specially crafted CDP packet. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-388, CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2019-1750?

It affects 1 product.


Products: Cisco Ios Xe.

## How do I fix CVE-2019-1750?

No fix has been published for CVE-2019-1750 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1750 being exploited?

There is no known exploitation of CVE-2019-1750 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-2019-1750 and fix it if it is affected.

What it is: CVE-2019-1750 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 27 Mar 2019. 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-2019-1750 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-2019-1750/ (Markdown: https://insights.sbomify.com/CVE-2019-1750/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1750
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1750
- OSV: https://osv.dev/vulnerability/CVE-2019-1750

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1750/
Summaries are generated and may contain mistakes; the official description above is the record.