CVE-2026-33799

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

MEDIUM

4.3

CVSS Score

Published: July 9, 2026 at 09:02 PM UTC

Updated: July 13, 2026 at 01:11 PM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

Using Junos OS by Juniper Networks?

Get instant alerts when new vulnerabilities affect Junos OS - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM4.3

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

Affected range stops below 21.2, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

95%

v < 21.2v < 21.2R3-S821.4 ≤ v < 21.4R3-S722.1 ≤ v < 22.1R3-S622.2 ≤ v < 22.2R3-S422.3 ≤ v < 22.3R3-S322.4 ≤ v < 22.4R3-S223.2 ≤ v < 23.2R223.4 ≤ v < 23.4R221.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.2 r3-s3 21.2 r3-s4 21.2 r3-s5 21.2 r3-s6 21.2 r3-s7 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s5 21.4 r3-s6 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r2-s1 22.1 r2-s2 22.1 r3 22.1 r3-s1 22.1 r3-s2 22.1 r3-s3 22.1 r3-s4 22.1 r3-s5 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r2 22.2 r2-s1 22.2 r2-s2 22.2 r3 22.2 r3-s1 22.2 r3-s2 22.2 r3-s3 22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.3 r2 22.3 r2-s2 22.3 r3 22.3 r3-s1 22.3 r3-s2 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r2-s1 22.4 r2-s2 22.4 r3 22.4 r3-s1 23.2 23.2 r1 23.2 r1-s1 23.2 r1-s2 23.4 23.4 r1 23.4 r1-s1 23.4 r1-s2

Affected range stops below 21.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S8, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 21.2R3-S8-EVO21.4 ≤ v < 21.4R3-S7-EVO22.1 ≤ v < 22.1*22.2 ≤ v < 22.2R3-S4-EVO22.3 ≤ v < 22.3R3-S3-EVO22.4 ≤ v < 22.4*23.2 ≤ v < 23.2R2-EVO23.4 ≤ v < 23.4R2-EVO21.4 22.1 22.2 22.3 22.4 23.2 23.4

Affected range stops below 21.2R3-S8-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4*, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA110074

References (1)

Vendor AdvisoryMitigation

Source: cverecord

https://supportportal.juniper.net/JSA110074

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMjuniper

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-787

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card