Junos OS: Execution with Unnecessary Privileges
CVE-2026-33793 is a high-severity execution with unnecessary privileges vulnerability in Junos OS from Juniper Networks, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 22.4R3-S7, 23.2R2-S4, 23.4R2-S6 as the first without the flaw, so updating Junos OS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.16% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Junos OS to 22.4R3-S7 or 23.2R2-S4 or 23.4R2-S6 or 24.2R1-S2, 24.2R2, whichever matches your release line, or a later version.
- Update Junos OS Evolved to 22.4R3-S7-EVO or 23.2R2-S4-EVO or 23.4R2-S6-EVO or 24.2R2-EVO, whichever matches your release line, or a later version.
- Update Junos to 22.4 or a later version.
- Read the advisory on supportportal.juniper.net for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Juniper Networks | Junos OS | before 22.4R3-S7; 23.2 up to, but not including, 23.2R2-S4; 23.4 up to, but not including, 23.4R2-S6; 24.2 up to, but not including, 24.2R1-S2, 24.2R2; 24.4 up to, but not including, 24.4R1-S2, 24.4R2 | 22.4R3-S7, 23.2R2-S4, 23.4R2-S6, 24.2R1-S2, 24.2R2, 24.4R1-S2, 24.4R2 |
| Juniper Networks | Junos OS Evolved | before 22.4R3-S7-EVO; 23.2 up to, but not including, 23.2R2-S4-EVO; 23.4 up to, but not including, 23.4R2-S6-EVO; 24.2 up to, but not including, 24.2R2-EVO; 24.4 up to, but not including, 24.4R1-S1-EVO, 24.4R2-EVO | 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S6-EVO, 24.2R2-EVO, 24.4R1-S1-EVO, 24.4R2-EVO |
| Juniper Networks | Junos | before 22.4; 22.4; 23.2; 23.4; 24.2; 24.4 | 22.4 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (juniper.net).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.5 | High | CNA (juniper.net) |
| CVSS 3.1 | 7.8 | High | CNA (juniper.net) |
Official description
An 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Execution with Unnecessary Privileges
The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.
How developers prevent this class of flaw
- Run your code using the lowest privileges that are required to accomplish the necessary tasks. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
- Identify the functionality that requires additional privileges, such as access to privileged operating system resources. Wrap and centralize this functionality if possible, and isolate the privileged code as much as possible from other code. Raise privileges as late as possible, and drop them as soon as possible to avoid CWE-271. Avoid weaknesses such as CWE-288 and CWE-420 by protecting all possible communication channels that could interact with the privileged code, such as a secondary socket that is only intended to be accessed by administrators.
- Identify the functionality that requires additional privileges, such as access to privileged operating system resources. Wrap and centralize this functionality if possible, and isolate the privileged code as much as possible from other code. Raise privileges as late as possible, and drop them as soon as possible to avoid CWE-271. Avoid weaknesses such as CWE-288 and CWE-420 by protecting all possible communication channels that could interact with the privileged code, such as a secondary socket that is only intended to be accessed by administrators.
More Execution with Unnecessary Privileges vulnerabilities (CWE-250)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- supportportal.juniper.net/JSA103142Mitigation
Other vulnerabilities in Junos OS
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 7.5 High severity
Recent Execution with Unnecessary Privileges vulnerabilities
- 7.7 High severity
- 7.8 High severity
- 9.8 Critical severity
- 9.9 Critical severity
- 10.0 Critical severity
- 7.8 High severity
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