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2022-01 Security Bulletin: Junos OS: QFX5000 Series, EX4600: Device may run out of memory, causing traffic loss, upon receipt of specific packets (CVE-2022-22174)



Article ID: JSA11280 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 1.0
Product Affected:
This issue affects Junos OS 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2. Affected platforms: EX4600, QFX5000 Series.

A vulnerability in the processing of inbound IPv6 packets in Juniper Networks Junos OS on QFX5000 Series and EX4600 switches may cause the memory to not be freed, leading to a packet DMA memory leak, and eventual Denial of Service (DoS) condition. Once the condition occurs, further packet processing will be impacted, creating a sustained Denial of Service (DoS) condition.

The following error logs may be observed using the "show heap" command and the device may eventually run out of memory if such packets are received continuously.

Jan 12 12:00:00 device-name fpc0 (buf alloc) failed allocating packet buffer
Jan 12 12:00:01 device-name fpc0 (buf alloc) failed allocating packet buffer

user@device-name> request pfe execute target fpc0 timeout 30 command "show heap"
ID Base       Total(b)    Free(b)     Used(b)     %   Name
-- ---------- ----------- ----------- ----------- --- -----------
0  246fc1a8   536870488   353653752   183216736   34  Kernel
1  91800000    16777216    12069680     4707536   28  DMA
2  92800000    75497472    69997640     5499832    7  PKT DMA DESC
3  106fc000   335544320   221425960   114118360   34  Bcm_sdk
4  97000000   176160768         200   176160568   99  Packet DMA
5  903fffe0    20971504    20971504           0    0  Blob

This issue affects Juniper Networks Junos OS on QFX5000 Series, EX4600:

  • 18.3R3 versions prior to 18.3R3-S6;
  • 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
  • 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
  • 19.2 versions prior to 19.2R1-S8, 19.2R3-S3;
  • 19.3 versions prior to 19.3R2-S7, 19.3R3-S4;
  • 19.4 versions prior to 19.4R2-S5, 19.4R3-S6;
  • 20.1 versions prior to 20.1R3-S1;
  • 20.2 versions prior to 20.2R3-S2;
  • 20.3 versions prior to 20.3R3-S1;
  • 20.4 versions prior to 20.4R3;
  • 21.1 versions prior to 21.1R2-S1, 21.1R3;
  • 21.2 versions prior to 21.2R1-S1, 21.2R2.

This issue does not affect Juniper Networks Junos OS:

  • Any versions prior to 17.4R3;
  • 18.1 versions prior to 18.1R3-S6;
  • 18.2 versions prior to 18.2R3;
  • 18.3 versions prior to 18.3R3;
  • 18.4 versions prior to 18.4R2;
  • 19.1 versions prior to 19.1R2.

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-2022-22174.


The following software releases have been updated to resolve this specific issue: Junos OS 18.3R3-S6, 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S7, 19.2R1-S8, 19.2R3-S3, 19.3R2-S7, 19.3R3-S4, 19.4R2-S5, 19.4R3-S6, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R3, 21.1R2-S1, 21.1R3, 21.2R1-S1, 21.2R2, 21.3R1, 21.4R1, and all subsequent releases.

This issue is being tracked as 1603531.

There are no viable workarounds for this issue.

Software releases or updates are available for download at

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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