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Aha • February 26, 2026

Juniper Networks recently published an advisory regarding a critical vulnerability, CVE-2026-21902 , affecting Junos OS Evolved on PTX Series routers.

This flaw allows an unauthenticated, network-based attacker to execute arbitrary code with root privileges, potentially leading to a complete takeover of the affected device. Organizations utilizing PTX Series routers are urged to apply available patches or implement recommended workarounds to mitigate risk.

Health-ISAC provides this information to increase situational awareness and encourage organizations to assess their level of risk to this vulnerability.

View the detailed bulletin below.

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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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