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14 January 2022

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             AUSCERT External Security Bulletin Redistribution

JSA11283 - 2022-01 Security Bulletin: Junos OS and Junos OS Evolved: After
  receiving a specific number of crafted packets snmpd will segmentation
       fault (SIGSEGV) requiring a manual restart. (CVE-2022-22177)
                              14 January 2022


        AusCERT Security Bulletin Summary

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-22177  

Original Bulletin: 

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2022-01 Security Bulletin: Junos OS and Junos OS Evolved: After receiving a specific number of crafted packets snmpd will segmentation fault (SIGSEGV) requiring a manual restart. (CVE-2022-22177)

Article ID  : JSA11283
Last Updated: 13 Jan 2022
Version     : 3.0

Product Affected:
This issue affects Junos OS 12.3, 15.1, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4,
20.1, 20.2, 20.3, 20.4, 21.1, 21.2. This issue affects any Junos OS Evolved
releases prior to 21.2R3-EVO, 21.3.
A release of illegal memory vulnerability in the snmpd daemon of Juniper
Networks Junos OS, Junos OS Evolved allows an attacker to halt the snmpd daemon
causing a sustained Denial of Service (DoS) to the service until it is manually

This issue impacts any version of SNMP - v1,v2, v3

This issue affects:
Juniper Networks Junos OS

  o 12.3 versions prior to 12.3R12-S20;
  o 15.1 versions prior to 15.1R7-S11;
  o 18.3 versions prior to 18.3R3-S6;
  o 18.4 versions prior to 18.4R2-S9, 18.4R3-S10;
  o 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
  o 19.2 versions prior to 19.2R1-S8, 19.2R3-S4;
  o 19.3 versions prior to 19.3R3-S4;
  o 19.4 versions prior to 19.4R2-S5, 19.4R3-S6;
  o 20.1 versions prior to 20.1R3-S2;
  o 20.2 versions prior to 20.2R3-S3;
  o 20.3 versions prior to 20.3R3-S1;
  o 20.4 versions prior to 20.4R3;
  o 21.1 versions prior to 21.1R2-S2, 21.1R3;
  o 21.2 versions prior to 21.2R1-S2, 21.2R2.

Juniper Networks Junos OS Evolved

  o 21.2 versions prior to 21.2R3-EVO;
  o 21.3 versions prior to 21.3R2-EVO.

The following minimal configuration is needed:
[snmp community 'community-name"] using a Read Write (RW) Community

Read Only (RO) communities are not impacted by this issue.

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

This issue was discovered during external security research.

This issue has been assigned CVE-2022-22177 .


The following software releases have been updated to resolve this specific

Junos OS: 12.3R12-S20, 15.1R7-S11, 18.3R3-S6, 18.4R2-S9, 18.4R3-S10, 19.1R2-S3,
19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4, 19.4R2-S5, 19.4R3-S6, 20.1R3-S2,
20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R2-S2, 21.1R3, 21.2R1-S2, 21.2R2, 21.3R1, and
all subsequent releases.

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

This issue is being tracked as 1613874 .


There are no workarounds for this issue.

For V1, V2 you can reduce the risk of exploitation by configuring the
client-list to limit access to network management system (NMS) machines.

See the Network Management and Monitoring Guide for further instructions.


[snmp client-list client-list-name "ip-addresses";]

For V3 you can reduce the risk of exploitation by configuring SNMP security to
trusted devices only.

For any release of SNMP you can reduce the risk of exploitation by implementing
source and destination IP filter rules as well as using Read Only communities
where possible.

Regardless of these risk reduction methods, an attacker able to spoof trusted
IP addresses can send the attack to an exposed and reachable SNMP RW community.

Software releases or updates are available for download at https://
support.juniper.net/support/downloads/ .
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
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."
Nanyu Zhong and Yu Zhang of VARAS at the Institute of Information Engineering

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