Junos OS: Privileged local user can gain access to a Linux-based FPC as root
A Missing Authentication for Critical Function vulnerability in command processing of Juniper Networks Junos OS allows a privileged local attacker to gain access to Linux-based line cards as root.
This issue affects systems running Junos OS using Linux-based line cards. Affected line cards include:
* MPC7, MPC8, MPC9, MPC10, MPC11
* LC2101, LC2103
* LC480, LC4800, LC9600
* MX304 (built-in FPC)
* MX-SPC3
* SRX5K-SPC3
* EX9200-40XS
* FPC3-PTX-U2, FPC3-PTX-U3
* FPC3-SFF-PTX
* LC1101, LC1102, LC1104, LC1105
This issue affects Junos OS:
* all versions before 22.4R3-S8,
* from 23.2 before 23.2R2-S6,
* from 23.4 before 23.4R2-S6,
* from 24.2 before 24.2R2-S3,
* from 24.4 before 24.4R2,
* from 25.2 before 25.2R2.
Problem Types
| Type | CWE ID | Description |
|---|
| CWE | CWE-306 | CWE-306 Missing Authentication for Critical Function |
Type: CWE
Description: CWE-306 Missing Authentication for Critical Function
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.1 | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| 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:L/SI:L/SA:L/AU:N/R:A/V:C/RE:M/U:Amber |
Version: 3.1
Base score: 6.7
Base severity: MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 8.4
Base severity: HIGH
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/AU:N/R:A/V:C/RE:M/U:Amber
Timeline
| Event | Date |
|---|
| Initial Publication | 2026-04-08 16:00:00 |
| Removed reference to EVO. Issue is specific to Junos OS with Linux-based line cards. | 2026-04-13 16:00:00 |
Event: Initial Publication
Date: 2026-04-08 16:00:00
Event: Removed reference to EVO. Issue is specific to Junos OS with Linux-based line cards.
Date: 2026-04-13 16:00:00