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

Summary

CVECVE-2026-33799
StatePUBLISHED
Assignerjuniper
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-09 21:16:54 UTC
Updated2026-07-10 17:49:57 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 5.3 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green

EPSS: 0.003600000 probability, percentile 0.280660000 (date 2026-07-12)

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write


VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.3MEDIUMCVSS: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/...
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Juniper Networks Junos OS affected 21.2R3-S8 custom Not specified
CNA Juniper Networks Junos OS affected 21.4 21.4R3-S7 custom Not specified
CNA Juniper Networks Junos OS affected 22.1 22.1R3-S6 custom Not specified
CNA Juniper Networks Junos OS affected 22.2 22.2R3-S4 custom Not specified
CNA Juniper Networks Junos OS affected 22.3 22.3R3-S3 custom Not specified
CNA Juniper Networks Junos OS affected 22.4 22.4R3-S2 custom Not specified
CNA Juniper Networks Junos OS affected 23.2 23.2R2 custom Not specified
CNA Juniper Networks Junos OS affected 23.4 23.4R2 custom Not specified
CNA Juniper Networks Junos OS Evolved affected 21.2R3-S8-EVO custom Not specified
CNA Juniper Networks Junos OS Evolved affected 21.4 21.4R3-S7-EVO custom Not specified
CNA Juniper Networks Junos OS Evolved affected 22.1 22.1* custom Not specified
CNA Juniper Networks Junos OS Evolved affected 22.2 22.2R3-S4-EVO custom Not specified
CNA Juniper Networks Junos OS Evolved affected 22.3 22.3R3-S3-EVO custom Not specified
CNA Juniper Networks Junos OS Evolved affected 22.4 22.4* custom Not specified
CNA Juniper Networks Junos OS Evolved affected 23.2 23.2R2-EVO custom Not specified
CNA Juniper Networks Junos OS Evolved affected 23.4 23.4R2-EVO custom Not specified

References

ReferenceSourceLinkTags
supportportal.juniper.net/JSA110074 [email protected] supportportal.juniper.net
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S8, 21.4R3-S7, 22.1R3-S6, 22.2R3-S4, 22.3R3-S3, 22.4R3-S2, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases. Junos OS Evolved: 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 23.2R2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.

Workarounds

CNA: There are no known workarounds for this issue. To reduce the risk of malicious exploitation, use access lists or firewall filters to limit access to the device via SNMPv3 only from trusted hosts.

Exploits

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

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