Riskcovery

CVE-2026-33799

Junos OS and Junos OS Evolved: Receipt of a specific SNMPv3 request results in memory leak and eventual snmpd crash

State
Published
Severity
5.3 Medium
Published
Jul 9, 2026
Updated
Jul 10, 2026
Reserved
Mar 23, 2026

Read the record on cve.org

Description

An Out-of-bounds Write vulnerability in the SNMP daemon (snmpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated network-based attacker sending specific valid SNMPv3 queries to trigger a memory leak. Over time, continuous receipt of these queries will result in snmpd process memory exhaustion, resulting in a process crash and restart, impacting the ability to monitor the system via SNMP.

Memory usage can be monitored using the following command:

user@device> show system processes extensive | match snmpd

This issue affects:

Junos OS:

* all versions before 21.2R3-S8; * from 21.4 before 21.4R3-S7; * from 22.1 before 22.1R3-S6; * from 22.2 before 22.2R3-S4; * from 22.3 before 22.3R3-S3; * from 22.4 before 22.4R3-S2; * from 23.2 before 23.2R2; * from 23.4 before 23.4R2.

Junos OS Evolved: * all versions before 21.2R3-S8-EVO; * from 21.4 before 21.4R3-S7-EVO; * all versions of 22.1-EVO, * from 22.2 before 22.2R3-S4-EVO; * from 22.3 before 22.3R3-S3-EVO; * all versions of 22.4-EVO, * from 23.2 before 23.2R2-EVO; * from 23.4 before 23.4R2-EVO.

Scores

CVSSScoreVectorSource
4.05.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M/U:Greenjuniper
3.14.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Ljuniper

Weaknesses

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 21.2R3-S8Affected
  • 21.4 to before 21.4R3-S7Affected
  • 22.1 to before 22.1R3-S6Affected
  • 22.2 to before 22.2R3-S4Affected
  • 22.3 to before 22.3R3-S3Affected
  • 22.4 to before 22.4R3-S2Affected
  • 23.2 to before 23.2R2Affected
  • 23.4 to before 23.4R2Affected
Junos OS EvolvedJuniper Networks
  • before 21.2R3-S8-EVOAffected
  • 21.4 to before 21.4R3-S7-EVOAffected
  • 22.1 to before 22.1*Affected
  • 22.2 to before 22.2R3-S4-EVOAffected
  • 22.3 to before 22.3R3-S3-EVOAffected
  • 22.4 to before 22.4*Affected
  • 23.2 to before 23.2R2-EVOAffected
  • 23.4 to before 23.4R2-EVOAffected

References

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