Junos OS and Junos OS Evolved: When an unsigned Python op script configuration is present, a local low privileged user can compromise the system

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Summary

CVECVE-2026-33793
StatePUBLISHED
Assignerjuniper
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 22:16:29 UTC
Updated2026-04-16 18:42:26 UTC
DescriptionAn Execution with Unnecessary Privileges vulnerability in the User Interface (UI) of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged attacker to gain root privileges, thus compromising the system. When a configuration that allows unsigned Python op scripts is present on the device, a non-root user is able to execute malicious op scripts as a root-equivalent user, leading to privilege escalation.  This issue affects Junos OS:  * All versions before 22.4R3-S7,  * from 23.2 before 23.2R2-S4,  * from 23.4 before 23.4R2-S6, * from 24.2 before 24.2R1-S2, 24.2R2,  * from 24.4 before 24.4R1-S2, 24.4R2;  Junos OS Evolved:  * All versions before 22.4R3-S7-EVO,  * from 23.2 before 23.2R2-S4-EVO,  * from 23.4 before 23.4R2-S6-EVO, * from 24.2 before 24.2R2-EVO,  * from 24.4 before 24.4R1-S1-EVO, 24.4R2-EVO.

Risk And Classification

Primary CVSS: v4.0 8.5 HIGH from [email protected]

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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:U/V:C/RE:M/U:Amber

EPSS: 0.000070000 probability, percentile 0.004890000 (date 2026-04-21)

Problem Types: CWE-250 | CWE-250 CWE-250: Execution with Unnecessary Privileges

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.5HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/C...
4.0CNACVSS8.5HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/...
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
Low

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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:U/V:C/RE:M/U:Amber

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Juniper Junos All All All All
Operating System Juniper Junos 22.4 - All All
Operating System Juniper Junos 22.4 r1 All All
Operating System Juniper Junos 22.4 r1-s1 All All
Operating System Juniper Junos 22.4 r1-s2 All All
Operating System Juniper Junos 22.4 r2 All All
Operating System Juniper Junos 22.4 r2-s1 All All
Operating System Juniper Junos 22.4 r2-s2 All All
Operating System Juniper Junos 22.4 r3 All All
Operating System Juniper Junos 22.4 r3-s1 All All
Operating System Juniper Junos 22.4 r3-s2 All All
Operating System Juniper Junos 22.4 r3-s3 All All
Operating System Juniper Junos 22.4 r3-s4 All All
Operating System Juniper Junos 22.4 r3-s5 All All
Operating System Juniper Junos 22.4 r3-s6 All All
Operating System Juniper Junos 23.2 - All All
Operating System Juniper Junos 23.2 r1 All All
Operating System Juniper Junos 23.2 r1-s1 All All
Operating System Juniper Junos 23.2 r1-s2 All All
Operating System Juniper Junos 23.2 r2 All All
Operating System Juniper Junos 23.2 r2-s1 All All
Operating System Juniper Junos 23.2 r2-s2 All All
Operating System Juniper Junos 23.2 r2-s3 All All
Operating System Juniper Junos 23.4 - All All
Operating System Juniper Junos 23.4 r1 All All
Operating System Juniper Junos 23.4 r1-s1 All All
Operating System Juniper Junos 23.4 r1-s2 All All
Operating System Juniper Junos 23.4 r2 All All
Operating System Juniper Junos 23.4 r2-s1 All All
Operating System Juniper Junos 23.4 r2-s2 All All
Operating System Juniper Junos 23.4 r2-s3 All All
Operating System Juniper Junos 23.4 r2-s4 All All
Operating System Juniper Junos 23.4 r2-s5 All All
Operating System Juniper Junos 24.2 - All All
Operating System Juniper Junos 24.2 r1 All All
Operating System Juniper Junos 24.2 r1-s1 All All
Operating System Juniper Junos 24.2 r2 All All
Operating System Juniper Junos 24.4 - All All
Operating System Juniper Junos 24.4 r1 All All
Operating System Juniper Junos 24.4 r2 All All
Operating System Juniper Junos Os Evolved All All All All
Operating System Juniper Junos Os Evolved 22.4 - All All
Operating System Juniper Junos Os Evolved 22.4 r1 All All
Operating System Juniper Junos Os Evolved 22.4 r1-s1 All All
Operating System Juniper Junos Os Evolved 22.4 r1-s2 All All
Operating System Juniper Junos Os Evolved 22.4 r2 All All
Operating System Juniper Junos Os Evolved 22.4 r2-s1 All All
Operating System Juniper Junos Os Evolved 22.4 r2-s2 All All
Operating System Juniper Junos Os Evolved 22.4 r3 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s1 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s2 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s3 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s4 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s5 All All
Operating System Juniper Junos Os Evolved 22.4 r3-s6 All All
Operating System Juniper Junos Os Evolved 23.2 - All All
Operating System Juniper Junos Os Evolved 23.2 r1 All All
Operating System Juniper Junos Os Evolved 23.2 r1-s1 All All
Operating System Juniper Junos Os Evolved 23.2 r1-s2 All All
Operating System Juniper Junos Os Evolved 23.2 r2 All All
Operating System Juniper Junos Os Evolved 23.2 r2-s1 All All
Operating System Juniper Junos Os Evolved 23.2 r2-s2 All All
Operating System Juniper Junos Os Evolved 23.2 r2-s3 All All
Operating System Juniper Junos Os Evolved 23.4 - All All
Operating System Juniper Junos Os Evolved 23.4 r1 All All
Operating System Juniper Junos Os Evolved 23.4 r1-s1 All All
Operating System Juniper Junos Os Evolved 23.4 r1-s2 All All
Operating System Juniper Junos Os Evolved 23.4 r2 All All
Operating System Juniper Junos Os Evolved 23.4 r2-s1 All All
Operating System Juniper Junos Os Evolved 23.4 r2-s2 All All
Operating System Juniper Junos Os Evolved 23.4 r2-s3 All All
Operating System Juniper Junos Os Evolved 23.4 r2-s4 All All
Operating System Juniper Junos Os Evolved 23.4 r2-s5 All All
Operating System Juniper Junos Os Evolved 24.2 - All All
Operating System Juniper Junos Os Evolved 24.2 r1 All All
Operating System Juniper Junos Os Evolved 24.2 r1-s2 All All
Operating System Juniper Junos Os Evolved 24.4 - All All
Operating System Juniper Junos Os Evolved 24.4 r1 All All
Operating System Juniper Junos Os Evolved 24.4 r2 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Juniper Networks Junos OS affected 22.4R3-S7 semver Not specified
CNA Juniper Networks Junos OS affected 23.2 23.2R2-S4 semver Not specified
CNA Juniper Networks Junos OS affected 23.4 23.4R2-S6 semver Not specified
CNA Juniper Networks Junos OS affected 24.2 24.2R1-S2, 24.2R2 semver Not specified
CNA Juniper Networks Junos OS affected 24.4 24.4R1-S2, 24.4R2 semver Not specified
CNA Juniper Networks Junos OS Evolved affected 22.4R3-S7-EVO semver Not specified
CNA Juniper Networks Junos OS Evolved affected 23.2 23.2R2-S4-EVO semver Not specified
CNA Juniper Networks Junos OS Evolved affected 23.4 23.4R2-S6-EVO semver Not specified
CNA Juniper Networks Junos OS Evolved affected 24.2 24.2R2-EVO semver Not specified
CNA Juniper Networks Junos OS Evolved affected 24.4 24.4R1-S1-EVO, 24.4R2-EVO semver Not specified

References

ReferenceSourceLinkTags
supportportal.juniper.net/JSA103142 [email protected] supportportal.juniper.net Mitigation, Vendor Advisory
kb.juniper.net/JSA103142 MITRE kb.juniper.net
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-04-08T16:00:00.000ZInitial Publication
CNA2026-04-16T16:00:00.000ZWhile 'language python3' allows an attacker to execute local Python scripts, the scenario with the highest risk of malicious exploitation occurs when an attacker can execute remote Python scripts

Solutions

CNA: The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S6-EVO, 24.2R2-EVO, 24.4R1-S1-EVO, 24.4R2-EVO, 25.2R1-EVO and all subsequent releases. Junos OS: 22.4R3-S7, 23.2R2-S4, 23.4R2-S6, 24.2R1-S2, 24.2R2, 24.4R1-S2, 24.4R2, 25.2R1 and all subsequent releases.

Workarounds

CNA: Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

Exploits

CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

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