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             AUSCERT External Security Bulletin Redistribution

Junos OS and Junos OS Evolved: In a BGP multipath scenario, when one of the
        contributing routes is flapping often and rapidly, rpd may
                          crash (CVE-2022-22225)
                              8 November 2022


        AusCERT Security Bulletin Summary

Product:           Junos OS
                   Junos OS evolved
Publisher:         Juniper Networks
Operating System:  Juniper
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-22225  

Original Bulletin: 

Comment: CVSS (Max):  5.9 CVE-2022-22225 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
         CVSS Source: NVD
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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Article ID:       JSA69875

Product Affected: This issue affects Junos OS 19.2, 20.2, 20.3, 20.4, 21.1, 
21.2, 21.3. This issue affects all versions of Junos OS Evolved.

Severity Level:   Medium

CVSS Score:       5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)


A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the 
Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved 
allows an unauthenticated attacker with an established BGP session to cause a 
Denial of Service (DoS).

In a BGP multipath scenario, when one of the contributing routes is flapping 
often and rapidly, rpd may crash. As this crash depends on whether a route is a 
contributing route, and on the internal timing of the events triggered by the 
flap this vulnerability is outside the direct control of a potential attacker.

This issue affects:

Juniper Networks Junos OS

    19.2 versions prior to 19.2R3-S6;
    20.2 versions prior to 20.2R3-S4;
    20.3 versions prior to 20.3R3-S3;
    20.4 versions prior to 20.4R3-S4;
    21.1 versions prior to 21.1R3;
    21.2 versions prior to 21.2R2;
    21.3 versions prior to 21.3R2.

Juniper Networks Junos OS Evolved

    All versions prior to 20.4R3-S4-EVO;
    21.1-EVO version 21.1R1-EVO  and later versions;
    21.2-EVO versions prior to 21.2R2-EVO;
    21.3-EVO versions prior to 21.3R2-EVO.

This issue does not affect:
Juniper Networks Junos OS versions 19.2 versions prior to 19.2R2, 19.3R1 and 
above prior to 20.2R1.

Juniper Networks Junos OS Evolved versions prior to 20.2R1-EVO.

A device can only be affected if the following BGP multipath configuration is 
in place:
[protocols bgp ... multipath]

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2022-22225.


The following software releases have been updated to resolve this specific 

Junos OS: 19.2R3-S6, 20.2R3-S4, 20.3R3-S3, 20.4R3-S4, 21.1R2, 21.2R2, 21.3R2, 
21.4R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S4-EVO, 21.2R2-EVO, 21.3R2-EVO, 21.4R1-EVO, and all 
subsequent releases.

This issue is being tracked as PR 1611128 which is visible on the Customer 
Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of 
Engineering (EOE) or End of Life (EOL).

Software Releases, patches and updates are available at 

There are no viable workarounds for this issue.

Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common 
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History:
2022-10-12: Initial Publication.
Related Information:

    KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin 
Publication Process
    KB16765: In which releases are vulnerabilities fixed?
    KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security 
    Report a Security Vulnerability - How to Contact the Juniper Networks 
Security Incident Response Team
    CVE-2022-22225 at cve.mitre.org

Last Updated: 2022-10-12
Created:      2022-10-12

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