Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2026-33791

Severity CVSS v4.0:
HIGH
Type:
CWE-78 OS Command Injections
Publication date:
09/04/2026
Last modified:
16/04/2026

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.<br /> <br /> Certain &amp;#39;set system&amp;#39; 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.<br /> This issue affects:<br /> <br /> Junos OS: <br /> <br /> <br /> <br /> * all versions before 22.4R3-S8, <br /> * from 23.2 before 23.2R2-S5, <br /> * from 23.4 before 23.4R2-S7, <br /> * from 24.2 before 24.2R2-S2, <br /> * from 24.4 before 24.4R2, <br /> * from 25.2 before 25.2R2; <br /> <br /> <br /> <br /> <br /> Junos OS Evolved: <br /> <br /> <br /> <br /> * all versions before 22.4R3-S8-EVO, <br /> * from 23.2 before 23.2R2-S5-EVO, <br /> * from 23.4 before 23.4R2-S7-EVO, <br /> * from 24.2 before 24.2R2-S2-EVO, <br /> * from 24.4 before 24.4R2-EVO, <br /> * from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.

Impact

Vector 4.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber CVSS v4.0 Severity and Metrics:

Base Score: 8.40 HIGH
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber

Attack Vector (AV): Local
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): High
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): High
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): Low
Automatable (AU): Yes
Recovery (R): Automatic
Value Density (V): Concentrated
Vulnerability Response Effort (RE): Moderate
Provider Urgency (U): Amber

Base Score 4.0
8.40
Severity 4.0
HIGH
Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.70 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
6.70
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* 22.4 (excluding)
cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:22.4:r3-s6:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools