# CVE-2021-32575: Improper network isolation in Hashicorp Nomad

> Attackers can perform ARP spoofing in Nomad bridge networking mode to intercept traffic between tasks on the same node.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-vf6q-9f2f-mwhv, GO-2022-0709, UBUNTU-CVE-2021-32575

## What is CVE-2021-32575?

CVE-2021-32575 is a medium-severity vulnerability in n/a, published on 17 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

HashiCorp Nomad and Nomad Enterprise up to version 1.0.4 bridge networking mode allows ARP spoofing from other bridged tasks on the same node. Fixed in 0.12.12, 1.0.5, and 1.1.0 RC1.

## Which versions are affected by CVE-2021-32575?

5 open source packages ship an affected version, including github.com/hashicorp/nomad. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/hashicorp/nomad` | Go | All versions | 0.12.12, 1.0.5 |
| `github.com/hashicorp/nomad` | Go | All versions | 0.12.12 |
| `github.com/hashicorp/nomad` | Go | All versions | 0.12.12 |
| `github.com/hashicorp/nomad` | Go | From 1.0.0 | 1.0.5 |
| `github.com/hashicorp/nomad` | Go | From 1.0.0 | 1.0.5 |

Products: Hashicorp Nomad.

## How do I fix CVE-2021-32575?

Upgrade github.com/hashicorp/nomad to a fixed version for your release line: 0.12.12 or 1.0.5.

## Is CVE-2021-32575 being exploited?

There is no known exploitation of CVE-2021-32575 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-1782](https://insights.sbomify.com/CVE-2023-1782/): Nomad Unauthenticated Client Agent HTTP Request Privilege Escalation (critical 10.0)
- [CVE-2022-30324](https://insights.sbomify.com/CVE-2022-30324/): Privilege escalation in Hashicorp Nomad (critical 9.8)
- [CVE-2020-7956](https://insights.sbomify.com/CVE-2020-7956/): Improper Certificate Validation in HashiCorp Nomad (critical 9.8)
- [CVE-2019-12618](https://insights.sbomify.com/CVE-2019-12618/): Hashicorp Nomad Access Control Issues (critical 9.8)
- [CVE-2020-27195](https://insights.sbomify.com/CVE-2020-27195/): Use After Free in HashiCorp Nomad (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32575 and fix it if it is affected.

What it is: CVE-2021-32575 is a medium-severity vulnerability in n/a, published on 17 Jun 2021. 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-2021-32575 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/hashicorp/nomad (Go): affected all versions; fixed in 0.12.12, 1.0.5
- github.com/hashicorp/nomad (Go): affected all versions; fixed in 0.12.12
- github.com/hashicorp/nomad (Go): affected all versions; fixed in 0.12.12
- github.com/hashicorp/nomad (Go): affected from 1.0.0; fixed in 1.0.5
- github.com/hashicorp/nomad (Go): affected from 1.0.0; fixed in 1.0.5

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-2021-32575/ (Markdown: https://insights.sbomify.com/CVE-2021-32575/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32575
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32575
- OSV: https://osv.dev/vulnerability/CVE-2021-32575

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32575/
Summaries are generated and may contain mistakes; the official description above is the record.