{"id":"CVE-2026-33791","aliases":["EUVD-2026-21207","GHSA-j4rr-c2v3-296r"],"status":"published","title":"Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root","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.\n\nCertain '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.\nThis issue affects:\n\nJunos OS: \n\n\n\n  *  all versions before 22.4R3-S8, \n  *  from 23.2 before 23.2R2-S5, \n  *  from 23.4 before 23.4R2-S7, \n  *  from 24.2 before 24.2R2-S2, \n  *  from 24.4 before 24.4R2, \n  *  from 25.2 before 25.2R2; \n\n\n\n\nJunos OS Evolved: \n\n\n\n  *  all versions before 22.4R3-S8-EVO, \n  *  from 23.2 before 23.2R2-S5-EVO, \n  *  from 23.4 before 23.4R2-S7-EVO, \n  *  from 24.2 before 24.2R2-S2-EVO, \n  *  from 24.4 before 24.4R2-EVO, \n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.","severity":{"version":"4.0","score":8.4,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00719,"percentile":0.54372,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2026-04-09T21:38:52Z","modified":"2026-10-26T22:10:00Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://kb.juniper.net/JSA107875","tags":["vendor-advisory","Mitigation","Vendor Advisory"]},{"url":"https://supportportal.juniper.net/JSA107875","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33791"},{"url":"https://github.com/advisories/GHSA-j4rr-c2v3-296r"}],"sources":{"cve":[{"id":"CVE-2026-33791","title":"Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root","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.\n\nCertain '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.\nThis issue affects:\n\nJunos OS: \n\n\n\n  *  all versions before 22.4R3-S8, \n  *  from 23.2 before 23.2R2-S5, \n  *  from 23.4 before 23.4R2-S7, \n  *  from 24.2 before 24.2R2-S2, \n  *  from 24.4 before 24.4R2, \n  *  from 25.2 before 25.2R2; \n\n\n\n\nJunos OS Evolved: \n\n\n\n  *  all versions before 22.4R3-S8-EVO, \n  *  from 23.2 before 23.2R2-S5-EVO, \n  *  from 23.4 before 23.4R2-S7-EVO, \n  *  from 24.2 before 24.2R2-S2-EVO, \n  *  from 24.4 before 24.4R2-EVO, \n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.","status":"published","published":"2026-04-09T21:38:52.747Z","modified":"2026-04-22T14:48:22.085Z","cvss":[{"version":"4.0","score":8.4,"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","level":"high","assessor":"cna"},{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:20:07.609948Z"}],"euvd":[{"id":"EUVD-2026-21207","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.\n\nCertain '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.\nThis issue affects:\n\nJunos OS: \n\n\n\n  *  all versions before 22.4R3-S8, \n  *  from 23.2 before 23.2R2-S5, \n  *  from 23.4 before 23.4R2-S7, \n  *  from 24.2 before 24.2R2-S2, \n  *  from 24.4 before 24.4R2, \n  *  from 25.2 before 25.2R2; \n\n\n\n\nJunos OS Evolved: \n\n\n\n  *  all versions before 22.4R3-S8-EVO, \n  *  from 23.2 before 23.2R2-S5-EVO, \n  *  from 23.4 before 23.4R2-S7-EVO, \n  *  from 24.2 before 24.2R2-S2-EVO, \n  *  from 24.4 before 24.4R2-EVO, \n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.","status":"published","published":"2026-04-09T21:38:52Z","modified":"2026-04-22T14:48:22Z","cvss":[{"version":"4.0","score":8.4,"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","level":"high"}],"updated_at":"2026-11-02T19:24:20.71791Z"}],"ghsa":[{"id":"GHSA-j4rr-c2v3-296r","title":"An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and...","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.\n\nCertain '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.\nThis issue affects:\n\nJunos OS: \n\n\n\n  *  all versions before 22.4R3-S8, \n  *  from 23.2 before 23.2R2-S5, \n  *  from 23.4 before 23.4R2-S7, \n  *  from 24.2 before 24.2R2-S2, \n  *  from 24.4 before 24.4R2, \n  *  from 25.2 before 25.2R2; \n\n\n\n\nJunos OS Evolved: \n\n\n\n  *  all versions before 22.4R3-S8-EVO, \n  *  from 23.2 before 23.2R2-S5-EVO, \n  *  from 23.4 before 23.4R2-S7-EVO, \n  *  from 24.2 before 24.2R2-S2-EVO, \n  *  from 24.4 before 24.4R2-EVO, \n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.","status":"published","published":"2026-04-10T00:30:29Z","modified":"2026-04-22T15:32:37Z","cvss":[{"version":"4.0","score":8.4,"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/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","level":"high"},{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T15:07:35.199773Z"}],"nvd":[{"id":"CVE-2026-33791","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.\n\nCertain '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.\nThis issue affects:\n\nJunos OS: \n\n\n\n  *  all versions before 22.4R3-S8, \n  *  from 23.2 before 23.2R2-S5, \n  *  from 23.4 before 23.4R2-S7, \n  *  from 24.2 before 24.2R2-S2, \n  *  from 24.4 before 24.4R2, \n  *  from 25.2 before 25.2R2; \n\n\n\n\nJunos OS Evolved: \n\n\n\n  *  all versions before 22.4R3-S8-EVO, \n  *  from 23.2 before 23.2R2-S5-EVO, \n  *  from 23.4 before 23.4R2-S7-EVO, \n  *  from 24.2 before 24.2R2-S2-EVO, \n  *  from 24.4 before 24.4R2-EVO, \n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.","status":"published","published":"2026-04-09T22:16:29.047Z","modified":"2026-10-26T22:10:00.163Z","cvss":[{"version":"4.0","score":8.4,"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/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","level":"high","assessor":"secondary"},{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:12:13.902911Z"}]}}