Warning: Multiple Critical Vulnerabilities in Juniper Networks Junos OS, Patch Immediately!

Juniper Networks has disclosed multiple critical vulnerabilities affecting Junos OS and Junos OS Evolved. These critical vulnerabilities are remotely exploitable without authentication or user interaction. Successful exploitation could lead to full device takeover, remote code execution, and routing daemon denial of service.

Enterprise networks rely on these edge gateways for core routing and firewalling. Prolonged denial of service or traffic processing failures directly degrade business continuity and operational stability.

If exploited this could lead to data breaches, system compromise, and operational downtime impacting confidentiality, integrity, and availability of critical businesses.

CVE-2026-101954 - Critical, CVSS 9.8 is an improper authentication vulnerability in the J-Web management interface. Under certain circumstances, an unauthenticated remote attacker could obtain root-level device configuration access and completely take over the device via reachable HTTP/HTTPS services when web management is enabled.

CVE-2026-101982 - Critical, CVSS 9.8 is a stack-based buffer overflow vulnerability in the routing protocol daemon (rpd). Under certain circumstances, an unauthenticated remote attacker could execute arbitrary code with root privileges or cause a denial of service.

The Oct Security Bulletin of Juniper also addresses several other critical rated vulnerabilities.

To remediate these threats, immediately upgrade the affected Junos OS instances to the specific software respins outlined in the 2026-10 Juniper Security Bulletin.

The Centre for Cybersecurity Belgium strongly recommends installing updates for vulnerable devices with the highest priority after thorough testing.

The CCB recommends organizations upscale monitoring and detection capabilities to identify any related suspicious activity and ensure a swift response in case of an intrusion. In case of an intrusion, you can report an incident via . While patching appliances or software to the newest version may protect against future exploitation, it does not remediate historic compromise.