# CVE-2019-1595: Cisco Nexus 5600 and 6000 Series Switches Fibre Channel over Ethernet Denial of Service Vulnerability

> An adjacent attacker can cause a denial of service on Cisco Nexus switches by sending crafted FCoE packets, leading to packet loops and high throughput.

- **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:** 6 Mar 2019
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-6m2h-jq7c-rvm8

## What is CVE-2019-1595?

CVE-2019-1595 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 6 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 Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an incorrect allocation of an internal interface index. An adjacent attacker with the ability to submit a crafted FCoE packet that crosses affected interfaces could trigger this vulnerability. A successful exploit could allow the attacker to cause a packet loop and high throughput on the affected interfaces, resulting in a DoS condition. This vulnerability has been fixed in version 7.3(5)N1(1).

Weakness: CWE-913 (Improper Control of Dynamically-Managed Code Resources)

## Which versions are affected by CVE-2019-1595?

It affects 1 product.


Products: Cisco Nx-Os.

## How do I fix CVE-2019-1595?

No fix has been published for CVE-2019-1595 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1595 being exploited?

There is no known exploitation of CVE-2019-1595 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Nx-Os

- [CVE-2024-20399](https://insights.sbomify.com/CVE-2024-20399/): Cisco NX-OS Command Injection (medium 6.0, exploited in the wild)
- [CVE-2021-1361](https://insights.sbomify.com/CVE-2021-1361/): Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability (critical 9.8)
- [CVE-2018-0301](https://insights.sbomify.com/CVE-2018-0301/): Memory corruption in Cisco NX-OS unknown (critical 9.8)
- [CVE-2016-1453](https://insights.sbomify.com/CVE-2016-1453/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-1341](https://insights.sbomify.com/CVE-2016-1341/): Hardcoded credentials in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1595 and fix it if it is affected.

What it is: CVE-2019-1595 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 6 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-2019-1595 in the wild and no public exploit code.

Affected product: Cisco Nx-Os. 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-2019-1595/ (Markdown: https://insights.sbomify.com/CVE-2019-1595/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1595
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1595
- OSV: https://osv.dev/vulnerability/CVE-2019-1595

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1595/
Summaries are generated and may contain mistakes; the official description above is the record.