CVE-2026-21903
Junos OS: Subscribing to telemetry sensors at scale causes all FPCs to crash
Vexday Risk Score
21Bajo
Decisión SSVC (CISA)
Track
Sin señal de explotación → monitorear
CVSS 7.1EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado
Ciclo de vida
15 ene 2026Publicada en NVD
Recomendación: Monitorear — sin señal de explotación por ahora.
A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS).
Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart.
The issue was not seen when YANG packages for the specific sensors were installed.
This issue affects Junos OS:
* all versions before 22.4R3-S7,
* 23.2 version before 23.2R2-S4,
* 23.4 versions before 23.4R2.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Productos afectados
Juniper Networks · Junos OS¿Quieres saber si tu infraestructura está expuesta a esto?
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