# CVE-2019-0006: Null dereference in Junos OS

> Crafted HTTP packets can crash the Packet Forwarding Engine manager or enable remote code execution on Juniper devices in Virtual Chassis configurations.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jan 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-8768-g4fm-ccgh

## What is CVE-2019-0006?

CVE-2019-0006 is a critical vulnerability in Juniper Junos, published on 15 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A certain crafted HTTP packet can trigger an uninitialized function pointer deference vulnerability in the Packet Forwarding Engine manager (fxpc) on all EX, QFX and MX Series devices in a Virtual Chassis configuration. This issue can result in a crash of the fxpc daemon or may potentially lead to remote code execution. This issue only occurs when the crafted packet it destined to the device. Affected releases are Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D47 on EX and QFX Virtual Chassis Platforms; 15.1 versions prior to 15.1R7-S3 all Virtual Chassis Platforms 15.1X53 versions prior to 15.1X53-D50 on EX and QFX Virtual Chassis Platforms.

Weakness: CWE-908 (Use of Uninitialized Resource)

## Which versions are affected by CVE-2019-0006?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2019-0006?

No fix has been published for CVE-2019-0006 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-0006 being exploited?

There is no known exploitation of CVE-2019-0006 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-2019-0006 and fix it if it is affected.

What it is: CVE-2019-0006 is a critical vulnerability in Juniper Junos, published on 15 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-0006 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-2019-0006/ (Markdown: https://insights.sbomify.com/CVE-2019-0006/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-0006
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-0006
- OSV: https://osv.dev/vulnerability/CVE-2019-0006

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-0006/
Summaries are generated and may contain mistakes; the official description above is the record.