CVE-2026-33791
Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root
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.
- Record
CVE-2026-33791- CVSS 4.0
- 8.4 High
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 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
EUVDEUVD-2026-21207
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.
- Record
EUVD-2026-21207- CVSS 4.0
- 8.4 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-j4rr-c2v3-296r
An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and...
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.
- Record
GHSA-j4rr-c2v3-296r- CVSS 4.0
- 8.4 High
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/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:Amber - CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-33791- CVSS 4.0
- 8.4 High
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/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:Amber - CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-33791 is a high vulnerability (CVSS 8.4) in Juniper Junos, published April 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.69%, the 53rd percentile. No source names a fixed version.