# CVE-2018-0102: Use after free in Cisco NX-OS

> An unauthenticated adjacent attacker can cause a denial of service on Cisco Nexus switches by triggering a double-free condition in the Pong tool.

- **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:** 18 Jan 2018
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-c2jm-2fx3-h7g6

## What is CVE-2018-0102?

CVE-2018-0102 is a high-severity use after free vulnerability in Cisco Nx-Os, published on 18 Jan 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 Pong tool of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software attempts to free the same area of memory twice. An attacker could exploit this vulnerability by sending a pong request to an affected device from a location on the network that causes the pong reply packet to egress both a FabricPath port and a non-FabricPath port. An exploit could allow the attacker to cause a dual or quad supervisor virtual port-channel (vPC) to reload. This vulnerability affects the following products when running Cisco NX-OS Software Release 7.2(1)D(1), 7.2(2)D1(1), or 7.2(2)D1(2) with both the Pong and FabricPath features enabled and the FabricPath port is actively monitored via a SPAN session: Cisco Nexus 7000 Series Switches and Cisco Nexus 7700 Series Switches. Cisco Bug IDs: CSCuv98660.

Weakness: CWE-415 (Double Free), CWE-399

## Which versions are affected by CVE-2018-0102?

It affects 1 product.


Products: Cisco Nx-Os.

## How do I fix CVE-2018-0102?

No fix has been published for CVE-2018-0102 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0102 being exploited?

There is no known exploitation of CVE-2018-0102 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-2018-0102 and fix it if it is affected.

What it is: CVE-2018-0102 is a high-severity use after free vulnerability in Cisco Nx-Os, published on 18 Jan 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-2018-0102 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-2018-0102/ (Markdown: https://insights.sbomify.com/CVE-2018-0102/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0102
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0102
- OSV: https://osv.dev/vulnerability/CVE-2018-0102

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0102/
Summaries are generated and may contain mistakes; the official description above is the record.