CVE-2022-22196

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

MEDIUM

6.5

CVSS Score

Published: April 14, 2022 at 03:50 PM UTC

Updated: June 17, 2026 at 04:27 AM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

v < 20.420.4 r1 20.4 r1-s1 20.4 r1-s2 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r2-s3 20.4 r3 20.4 r3-s1 20.4 r3-s2 21.2 r1 21.2 r1-s1

Affected range stops below 20.4, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

95%

19.3 ≤ v < 19.3R3-S419.4 ≤ v < 19.4R2-S6, 19.4R3-S620.1 ≤ v < 20.1R3-S220.2 ≤ v < 20.2R3-S320.3 ≤ v < 20.3R3-S120.4 ≤ v < 20.4R321.1 ≤ v < 21.1R321.2 ≤ v < 21.2R219.3 19.3 r1 19.3 r1-s1 19.3 r2 19.3 r2-s1 19.3 r2-s2 19.3 r2-s3 19.3 r2-s4 19.3 r2-s5 19.3 r2-s6 19.3 r3 19.3 r3-s1 19.3 r3-s2 19.3 r3-s3 19.4 19.4 r1 19.4 r1-s1 19.4 r1-s2 19.4 r1-s3 19.4 r1-s4 19.4 r2 19.4 r2-s1 19.4 r2-s2 19.4 r2-s3 19.4 r2-s4 19.4 r2-s5 19.4 r3 19.4 r3-s1 19.4 r3-s2 19.4 r3-s3 19.4 r3-s4 19.4 r3-s5 20.1 20.1 r1 20.1 r1-s1 20.1 r1-s2 20.1 r1-s3 20.1 r1-s4 20.1 r2 20.1 r2-s1 20.1 r2-s2 20.1 r3 20.1 r3-s1 20.2 20.2 r1 20.2 r1-s1 20.2 r1-s2 20.2 r1-s3 20.2 r2 20.2 r2-s1 20.2 r2-s2 20.2 r2-s3 20.2 r3 20.2 r3-s1 20.2 r3-s2 20.3 20.3 r1 20.3 r1-s1 20.3 r2 20.3 r2-s1 20.3 r3 20.4 20.4 r1 20.4 r1-s1 20.4 r2 20.4 r2-s1 20.4 r2-s2 21.1 21.1 r1 21.1 r1-s1 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2

Vendor states this is fixed in 19.3R1 (unaffected)

Affected range stops below 19.3R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.4R2-S6, 19.4R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.1R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.2R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 20.4R3-S3-EVO21.2 ≤ v < 21.2R2-EVO21.2

Affected range stops below 20.4R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.juniper.net/JSA69509

References (1)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA69509

CVSS

6.5MEDIUMjuniper

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-754

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