CVE-2025-30650 Overview
A Missing Authentication for Critical Function vulnerability (CWE-306) has been identified in the command processing functionality of Juniper Networks Junos OS. This security flaw allows a privileged local attacker to gain unauthorized root-level access to line cards running Junos OS Evolved. The vulnerability affects systems running Junos OS that utilize Linux-based line cards, presenting a significant risk to enterprise network infrastructure deployments.
Critical Impact
A privileged local attacker can escalate privileges to root on affected line cards, potentially compromising the integrity and availability of critical network infrastructure components.
Affected Products
- Junos OS all versions before 22.4R3-S8
- Junos OS from 23.2 before 23.2R2-S6
- Junos OS from 23.4 before 23.4R2-S6
- Junos OS from 24.2 before 24.2R2-S3
- Junos OS from 24.4 before 24.4R2
- Junos OS from 25.2 before 25.2R2
- Affected Line Cards: 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
Discovery Timeline
- April 8, 2026 - CVE-2025-30650 published to NVD
- April 9, 2026 - Last updated in NVD database
Technical Details for CVE-2025-30650
Vulnerability Analysis
This vulnerability stems from a missing authentication mechanism in the command processing subsystem of Junos OS. When a privileged local user executes certain commands, the system fails to properly authenticate the request before processing it on Linux-based line cards. This authentication gap creates an opportunity for privilege escalation from a privileged local user context to full root access on the affected line card hardware.
The attack requires local access to the device and elevated privileges, which somewhat limits the initial attack surface. However, once exploited, the attacker gains complete control over the line card operating system, enabling them to modify configurations, intercept traffic, or use the compromised component as a pivot point for further network attacks.
Root Cause
The root cause of CVE-2025-30650 is a missing authentication check (CWE-306) in the command processing pipeline. Critical functions that interact with Linux-based line cards do not verify that the requesting user has appropriate authorization to execute privileged operations on the line card subsystem. This design flaw allows authenticated users with elevated privileges on the main system to bypass intended security boundaries and gain root access to the line card's operating environment.
Attack Vector
The attack vector is local, requiring the attacker to have privileged access to the Junos OS device. The exploitation flow involves:
- The attacker establishes a privileged local session on the affected Junos OS device
- The attacker executes specific commands targeting line card management functions
- Due to the missing authentication check, the command is processed without proper authorization verification
- The attacker gains root-level access to the targeted line card running Junos OS Evolved
The vulnerability affects a wide range of line card hardware across multiple Juniper product families, including MPC, LC, MX, SRX, and EX series modules. For detailed technical information, refer to the Juniper Security Advisory JSA107863 and the GitHub Security Advisory.
Detection Methods for CVE-2025-30650
Indicators of Compromise
- Unexpected root-level processes running on Linux-based line cards
- Anomalous command execution patterns targeting line card management interfaces
- Unauthorized configuration changes on line card subsystems
- Unusual authentication events or session establishment on line cards
Detection Strategies
- Monitor system logs for privilege escalation attempts targeting line card components
- Implement file integrity monitoring on line card file systems to detect unauthorized modifications
- Review command history and audit logs for suspicious command sequences executed by privileged users
- Deploy network behavior analysis to identify unusual traffic patterns originating from line cards
Monitoring Recommendations
- Enable enhanced logging for all line card management commands
- Configure alerting for root-level activity on Linux-based line card subsystems
- Implement regular auditing of privileged user activities on Junos OS devices
- Monitor for deviations from baseline behavior on affected line card models
How to Mitigate CVE-2025-30650
Immediate Actions Required
- Audit all privileged user accounts on affected Junos OS devices and revoke unnecessary privileges
- Apply principle of least privilege to all administrative accounts
- Implement additional access controls to limit physical and logical access to affected devices
- Review and harden authentication mechanisms for device management interfaces
Patch Information
Juniper Networks has released security patches to address CVE-2025-30650. Organizations should upgrade to the following patched versions:
- Upgrade to 22.4R3-S8 or later for versions before 22.4
- Upgrade to 23.2R2-S6 or later for versions 23.2.x
- Upgrade to 23.4R2-S6 or later for versions 23.4.x
- Upgrade to 24.2R2-S3 or later for versions 24.2.x
- Upgrade to 24.4R2 or later for versions 24.4.x
- Upgrade to 25.2R2 or later for versions 25.2.x
For detailed upgrade instructions and patch availability, consult the Juniper Security Advisory JSA107863.
Workarounds
- Restrict access to affected devices to only essential administrative personnel
- Implement network segmentation to isolate management interfaces from general network traffic
- Enable multi-factor authentication for all privileged access to Junos OS devices
- Monitor privileged account usage closely until patches can be applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
