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JSA11261 - 2022-01 Security Bulletin: SRX Series and MX Series with SPC3: A
        high percentage of fragments might lead to high latency or
                       packet drops (CVE-2022-22153)
                              13 January 2022


        AusCERT Security Bulletin Summary

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-22153  

Original Bulletin: 

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2022-01 Security Bulletin: SRX Series and MX Series with SPC3: A high percentage of fragments might lead to high latency or packet drops (CVE-2022-22153)

Article ID  : JSA11261
Last Updated: 12 Jan 2022
Version     : 1.0

Product Affected:
This issue affects all versions of Junos OS. Affected platforms: MX Series with
SPC3, SRX Series.

An Insufficient Algorithmic Complexity combined with an Allocation of Resources
Without Limits or Throttling vulnerability in the flow processing daemon
(flowd) of Juniper Networks Junos OS on SRX Series and MX Series with SPC3
allows an unauthenticated network attacker to cause latency in transit packet
processing and even packet loss.

If transit traffic includes a significant percentage (> 5%) of fragmented
packets which need to be reassembled, high latency or packet drops might be

This issue affects Juniper Networks Junos OS on SRX Series, MX Series with

  o All versions prior to 18.2R3;
  o 18.3 versions prior to 18.3R3;
  o 18.4 versions prior to 18.4R2-S9, 18.4R3;
  o 19.1 versions prior to 19.1R2;
  o 19.2 versions prior to 19.2R1-S1, 19.2R2.

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

This issue was seen during production usage.

This issue has been assigned CVE-2022-22153 .


The following software releases have been updated to resolve this specific
issue: 18.2R3, 18.3R3, 18.4R2-S9, 18.4R3, 19.1R2, 19.2R1-S1, 19.2R2, 19.3R1,
and all subsequent releases.

This issue is being tracked as 1406465 .

There are no viable workarounds for this issue.
Software releases or updates are available for download at https://
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
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."

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