Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root
Summary
| CVE | CVE-2026-33791 |
|---|---|
| State | PUBLISHED |
| Assigner | juniper |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-09 22:16:29 UTC |
| Updated | 2026-04-09 22:16:29 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 8.4 HIGH from [email protected]
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
EPSS: 0.000410000 probability, percentile 0.126860000 (date 2026-04-10)
Problem Types: CWE-78 | CWE-78 CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 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/C... |
| 4.0 | CNA | CVSS | 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/... |
| 3.1 | [email protected] | Primary | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
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 v3.1 Breakdown
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Juniper Networks | Junos OS | affected 22.4R3-S8 semver | Not specified |
| CNA | Juniper Networks | Junos OS | affected 23.2 23.2R2-S5 semver | Not specified |
| CNA | Juniper Networks | Junos OS | affected 23.4 23.4R2-S7 semver | Not specified |
| CNA | Juniper Networks | Junos OS | affected 24.2 24.2R2-S2 semver | Not specified |
| CNA | Juniper Networks | Junos OS | affected 24.4 24.4R2 semver | Not specified |
| CNA | Juniper Networks | Junos OS | affected 25.2 25.2R2 semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 22.4R3-S8-EVO semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 23.2 23.2R2-S5-EVO semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 23.4 23.4R2-S7-EVO semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 24.2 24.2R2-S2-EVO semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 24.4 24.4R2-EVO semver | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 25.2 25.2R1-S1-EVO, 25.2R2-EVO semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| kb.juniper.net/JSA107875 | [email protected] | kb.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 22.4R3-S8, 23.2R2-S5, 23.4R2-S7, 24.2R2-S2, 24.4R2, 25.2R2, 25.4R1, and all subsequent releases. Junos OS Evolved 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-S7-EVO, 24.2R2-S2-EVO, 24.4R2-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.
Workarounds
CNA: One of the following mitigations will reduce the risk of malicious exploitation: * Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators. * Avoid configuring access to any part of the 'set system' stanza for non-privileged users.
Exploits
CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.