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Critical Vulnerabilities in Juniper Junos OS Require Immediate Patching

Critical Vulnerabilities in Juniper Junos OS Require Immediate Patching

First seen 17 Oct 2026, 16:47 UTC • •
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ThreatCluster AI
ThreatCluster •October 17, 2026 at 18:49 UTC

Juniper Networks has disclosed multiple critical vulnerabilities in Junos OS and Junos OS Evolved, which are remotely exploitable without authentication. The vulnerabilities include CVE-2026-101954, an improper authentication flaw in the J-Web management interface, and CVE-2026-101982, a stack-based buffer overflow in the routing protocol daemon. Both vulnerabilities have a CVSS score of 9.8, indicating critical severity. Successful exploitation could lead to full device takeover, remote code execution, and denial of service, impacting enterprise networks' operational stability. Organizations are urged to upgrade affected systems immediately as per the October 2026 Security Bulletin. The Centre for Cybersecurity Belgium recommends heightened monitoring for suspicious activity. Patching is essential to prevent potential data breaches and operational downtime.

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Timeline

2026-10-14
CVE-2026-101954 and CVE-2026-101982 published
Juniper Networks disclosed two critical vulnerabilities in Junos OS with a CVSS score of 9.8.
Hkcert
2026-10-16
Juniper Security Bulletin released
Juniper Networks issued a security bulletin recommending immediate upgrades to affected Junos OS instances.
Ccb.Belgium.Be

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Common questions

What are the specific vulnerabilities?
CVE-2026-101954 is an improper authentication flaw, and CVE-2026-101982 is a stack-based buffer overflow, both with a CVSS score of 9.8.
How urgent is the patching?
Patching is urgent as both vulnerabilities are critical and can be exploited remotely without authentication.
What should organizations do now?
Organizations should immediately upgrade their Junos OS instances as per the recommendations in the security bulletin.