Introduction
A single API flood can take down all management access to Juniper's Junos Space. Until someone reboots the system by hand, administrators cannot respond to incidents or do routine maintenance. CVE-2025-59975 is a critical uncontrolled resource consumption flaw in the Junos Space HTTP daemon, and unauthenticated attackers can use it 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 large presence in enterprise and service provider markets. Junos Space is Juniper's flagship network management suite. It is 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. An attacker triggers it by flooding the management API with inbound HTTP connection requests. The HTTP daemon allocates a file descriptor from the operating system's limited pool for each connection, and Junos Space does not enforce adequate rate limiting or resource controls on those inbound connections.
As simultaneous connections pile up, they eventually consume every available file descriptor. From that point the HTTP daemon cannot accept new connections. Legitimate management access through the WebUI and SSH is blocked too, because those services also need file handles. The system does not recover on its own. Only a manual reboot restores management functionality.
The attack needs no authentication, and it can be launched remotely if the management interface is reachable from untrusted networks. Standalone and clustered Junos Space deployments are both 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
- The vulnerability is in the HTTP daemon (Apache httpd) component
Vendor Security History
Juniper Networks runs a dedicated Security Incident Response Team (SIRT) and has a history of timely vulnerability disclosures and patch releases. Earlier Junos Space advisories have covered both command injection and denial of service vulnerabilities. Juniper's security response processes follow industry standards, and the company usually releases patches at the same time as its advisories.
