Introduction
A single API flood can take down all management access to Juniper's Junos Space, leaving administrators unable to respond to incidents or perform routine maintenance until a manual reboot is performed. This scenario is not theoretical: CVE-2025-59975 exposes a critical uncontrolled resource consumption flaw in Junos Space's HTTP daemon, allowing unauthenticated attackers to trigger a denial of service from anywhere on the network.
About Juniper Networks and Junos Space: Juniper Networks is a leading global provider of networking equipment and management platforms, with a significant presence in enterprise and service provider markets. Junos Space is Juniper's flagship network management suite, widely used for centralized device management, automation, and monitoring across large-scale environments.
Technical Information
CVE-2025-59975 is an uncontrolled resource consumption vulnerability (CWE-400) in the HTTP daemon (Apache httpd) component of Junos Space. The vulnerability is triggered when an attacker floods the management API with inbound HTTP connection requests. For each connection, the HTTP daemon allocates a file descriptor from the operating system's limited pool. Junos Space fails to enforce adequate rate limiting or resource controls on these inbound connections.
As the number of simultaneous connections increases, all available file descriptors are eventually consumed. Once exhausted, the HTTP daemon cannot accept new connections. This blocks legitimate management access through both the WebUI and SSH, as these services also require file handles. The system does not recover automatically; only a manual reboot restores management functionality. The attack requires no authentication and can be launched remotely if the management interface is accessible from untrusted networks. Both standalone and clustered Junos Space deployments are affected. The root cause is insufficient resource management and connection handling in the HTTP daemon under high load. No public code snippets or proof of concept are available.
Affected Systems and Versions
- Junos Space: All versions before 22.2R1 Patch V3
- Junos Space: 23.1 before 23.1R1 Patch V3
- Both standalone and clustered deployments are vulnerable
- Vulnerability is present in the HTTP daemon (Apache httpd) component
Vendor Security History
Juniper Networks maintains a dedicated Security Incident Response Team (SIRT) and has a history of timely vulnerability disclosures and patch releases. Previous advisories for Junos Space have included both command injection and denial of service vulnerabilities. Juniper's security response processes align with industry standards, and patches are typically released concurrently with advisories.
