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

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.

Scores

EPSS (exploitation in 30 days)

0.39% · top 67% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• CWE-754 Improper Check for Unusual or Exceptional Conditions (opens in a new tab)All about CWE-754 and its CVEs
• Denial of Service (DoS)

Affected products

• Juniper Networks · Junos OS

  • unaffected unspecified – < 19.3R1
  • affected 19.3 – < 19.3R3-S4
  • affected 19.4 – < 19.4R2-S6, 19.4R3-S6
  • affected 20.1 – < 20.1R3-S2
  • affected 20.2 – < 20.2R3-S3
  • affected 20.3 – < 20.3R3-S1
  • affected 20.4 – < 20.4R3
  • affected 21.1 – < 21.1R3
  • affected 21.2 – < 21.2R2

• Juniper Networks · Junos OS Evolved

  • affected unspecified – < 20.4R3-S3-EVO
  • affected 21.2 – < 21.2R2-EVO

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS: 19.3R3-S4, 19.4R2-S6, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases; Junos OS Evolved: 20.4R3-S3-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.

Workaround: There are no workarounds for this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

• https://kb.juniper.net/JSA69509 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-22196](https://trackcve.app/badge/CVE-2022-22196.svg)](https://trackcve.app/cve/CVE-2022-22196)

Record last updated 16 Sept 2024, 20:59 UTC.