# CVE-2019-0067: Denial of service in Junos OS

> An attacker can cause a prolonged denial of service by sending crafted IPv6 packets to devices configured with MC-LAG.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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:** 9 Oct 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-j6jw-rjg4-7274

## What is CVE-2019-0067?

CVE-2019-0067 is a medium-severity denial of service vulnerability in Juniper Junos, published on 9 Oct 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Receipt of a specific link-local IPv6 packet destined to the RE may cause the system to crash and restart (vmcore). By continuously sending a specially crafted IPv6 packet, an attacker can repeatedly crash the system causing a prolonged Denial of Service (DoS). This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R6-S2, 16.1R7; 16.2 versions prior to 16.2R2-S10; 17.1 versions prior to 17.1R3. This issue does not affect Juniper Networks Junos OS version 15.1 and prior versions.

## Which versions are affected by CVE-2019-0067?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2019-0067?

No fix has been published for CVE-2019-0067 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-0067 being exploited?

There is no known exploitation of CVE-2019-0067 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos

- [CVE-2023-36845](https://insights.sbomify.com/CVE-2023-36845/): Juniper Junos OS EX Series and SRX Series PHP External Variable Modification (critical 9.8, exploited in the wild)
- [CVE-2020-1631](https://insights.sbomify.com/CVE-2020-1631/): Juniper Junos OS Path Traversal (high 8.8, exploited in the wild)
- [CVE-2025-21590](https://insights.sbomify.com/CVE-2025-21590/): Juniper Junos OS Improper Isolation or Compartmentalization (medium 6.7, exploited in the wild)
- [CVE-2023-36851](https://insights.sbomify.com/CVE-2023-36851/): Juniper Junos OS SRX Series Missing Authentication for Critical Function (medium 5.3, exploited in the wild)
- [CVE-2023-36844](https://insights.sbomify.com/CVE-2023-36844/): Juniper Junos OS EX Series PHP External Variable Modification (medium 5.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-0067 and fix it if it is affected.

What it is: CVE-2019-0067 is a medium-severity denial of service vulnerability in Juniper Junos, published on 9 Oct 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-2019-0067 in the wild and no public exploit code.

Affected product: Juniper Junos. 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-2019-0067/ (Markdown: https://insights.sbomify.com/CVE-2019-0067/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-0067
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-0067
- OSV: https://osv.dev/vulnerability/CVE-2019-0067

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-0067/
Summaries are generated and may contain mistakes; the official description above is the record.