CVE-2025-52963 in Junos OS
Summary
by MITRE • 07/11/2025
An Improper Access Control vulnerability in the User Interface (UI) of Juniper Networks Junos OS allows a local, low-privileged attacker to bring down an interface, leading to a Denial-of-Service.
Users with "view" permissions can run a specific request interface command which allows the user to shut down the interface. This issue affects Junos OS:
* All versions before 21.2R3-S9, * from 21.4 before 21.4R3-S11, * from 22.2 before 22.2R3-S7, * from 22.4 before 22.4R3-S7, * from 23.2 before 23.2R2-S4, * from 23.4 before 23.4R2-S5, * from 24.2 before 24.2R2-S1, * from 24.4 before 24.4R1-S3, 24.4R2.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 04/29/2026
This vulnerability represents a critical improper access control flaw in Juniper Networks Junos OS that undermines the principle of least privilege and privilege separation within the user interface. The issue stems from insufficient authorization checks that allow users with minimal view permissions to execute administrative commands that should be restricted to higher-privileged users. This misconfiguration creates a pathway for local attackers to escalate their privileges through unauthorized interface management operations, directly violating security best practices established in cybersecurity frameworks such as the NIST Cybersecurity Framework and ISO 27001 controls. The vulnerability specifically affects a broad range of Junos OS versions across multiple release branches, indicating a systemic issue that has persisted across several major version lines.
The technical exploitation of this vulnerability occurs through a specific interface command that permits users with view-level permissions to shut down network interfaces. This command execution bypasses normal access control mechanisms that should prevent non-administrative users from performing interface management operations. The flaw demonstrates a clear violation of CWE-285, which addresses improper authorization in software systems, and aligns with ATT&CK technique T1068 by enabling local privilege escalation through the exploitation of weak access controls. The affected command interface likely operates without proper authentication checks for administrative functions, allowing unauthorized users to execute shutdown operations that can disrupt network connectivity and service availability.
The operational impact of this vulnerability extends beyond simple denial-of-service conditions to potentially compromise network stability and availability. When an attacker successfully executes interface shutdown commands, they can cause immediate disruption to network services, creating cascading effects that may impact multiple network segments depending on the interface affected. This vulnerability can be particularly dangerous in production environments where network uptime is critical, as it allows attackers to create service interruptions without requiring elevated privileges. The attack surface is further expanded by the vulnerability's presence across multiple Junos OS versions, meaning organizations with diverse network infrastructure may face widespread exposure across their network estate. The impact is compounded by the fact that this is a local vulnerability, meaning that attackers need only have access to a view-level account on the device to exploit the flaw, making it accessible through various attack vectors including compromised user credentials or insider threats.
Organizations should prioritize immediate patching of affected Junos OS versions to remediate this access control vulnerability. The recommended mitigation strategy involves upgrading to the patched versions specified in the security advisory, which typically include comprehensive access control enhancements and authorization validation mechanisms. Network administrators should also implement additional monitoring controls to detect unauthorized interface management activities and establish stricter access control policies that enforce proper privilege separation. Security teams should consider implementing network segmentation and privileged access management solutions to limit the potential impact of such vulnerabilities. The vulnerability also highlights the importance of regular security assessments and access control reviews, as it demonstrates how seemingly minor configuration issues can create significant security risks. Organizations should conduct thorough inventory assessments to identify all affected devices and establish incident response procedures specifically addressing unauthorized interface management operations to ensure rapid detection and remediation of similar access control flaws.