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Juniper issues emergency patch for critical PTX router RCE

Securityaffairs.Co •Pierluigi Paganini • February 27, 2026

Juniper released an emergency patch for Junos OS Evolved to fix CVE-2026-21902, a critical RCE flaw affecting PTX routers. Juniper Networks issued an out-of-band security update for Junos OS Evolved to address a critical remote code execution vulnerability, tracked as CVE-2026-21902 (CVSS score of 9.3), impacting PTX routers. The company urges customers to apply the […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Vulnerability in Juniper PTX Routers Allows Remote Code Execution A critical vulnerability identified as CVE-2026-21902 affects the Junos OS Evolved on PTX Series routers, enabling unauthenticated attackers to execute code with root privileges. These routers are widely used by internet service providers and cloud applications, making this flaw particularly significant for network security. The vulnerability was published on February 25, 2026. 15 sources 66

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Juniper issues emergency patch for critical PTX router RCE

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