CVE-2026-33791

Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root

MEDIUM

6.7

CVSS Score

Published: April 9, 2026 at 09:38 PM UTC

Updated: October 26, 2026 at 10:10 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

MEDIUM6.7

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, leading to a complete compromise of the system. Certain 'set system' commands, when executed with crafted arguments, are not properly sanitized, allowing for arbitrary shell injection. These shell commands are executed as root, potentially allowing for complete control of the vulnerable system. This issue affects: Junos OS: * all versions before 22.4R3-S8, * from 23.2 before 23.2R2-S5, * from 23.4 before 23.4R2-S7, * from 24.2 before 24.2R2-S2, * from 24.4 before 24.4R2, * from 25.2 before 25.2R2; Junos OS Evolved: * all versions before 22.4R3-S8-EVO, * from 23.2 before 23.2R2-S5-EVO, * from 23.4 before 23.4R2-S7-EVO, * from 24.2 before 24.2R2-S2-EVO, * from 24.4 before 24.4R2-EVO, * from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.

Affected

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

Junos · Juniper Networks

95%

Affected range stops below 22.4R3-S8, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.2R2-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.4R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

90%

v < 22.4R3-S8-EVO23.2 ≤ v < 23.2R2-S5-EVO23.4 ≤ v < 23.4R2-S7-EVO24.2 ≤ v < 24.2R2-S2-EVO24.4 ≤ v < 24.4R2-EVO25.2 ≤ v < 25.2R1-S1-EVO, 25.2R2-EVO23.2 23.4 24.2 24.4 25.2

Affected range stops below 22.4R3-S8-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S5-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.2R2-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.4R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.2R1-S1-EVO, 25.2R2-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

References (2)

Vendor AdvisoryMitigation

Source: cverecord

https://kb.juniper.net/JSA107875

Vendor Advisory

Source: cverecord

https://supportportal.juniper.net/JSA107875

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

6.7MEDIUMjuniper

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-78

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