CVE-2025-30649
Estado: AnalizadaAlta (8.7)—
An Improper Input Validation vulnerability in the syslog stream TCP transport of Juniper Networks Junos OS on MX240, MX480 and MX960 devices with MX-SPC3 Security Services Card allows an unauthenticated, network-based attacker, to send specific spoofed packets to cause a CPU Denial of Service (DoS) to the MX-SPC3 SPUs.
Continued receipt and processing of these specific packets will sustain the DoS condition.
An indicator of compromise will indicate the SPC3 SPUs utilization has spiked.
Detalles técnicos trazas, registros y código del informe original
This issue affects Junos OS: * All versions before 22.2R3-S6,
* from 22.4 before 22.4R3-S4,
* from 23.2 before 23.2R2-S3,
* from 23.4 before 23.4R2-S4,
* from 24.2 before 24.2R1-S2, 24.2R2
For example:
user@device> show services service-sets summary
Service sets CPU
Interface configured Bytes used Session bytes used Policy bytes used utilization
"interface" 1 "bytes" (percent%) "sessions" ("percent"%) "bytes" ("percent"%) 99.97 % OVLD <<<<<< look for high CPU usageCVSS
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:M/U:Amber
- Puntuación base: 8.7
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.42%
- Percentil entre todas las CVEs puntuadas: 34
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
Vector CVSS con AV:N/AC:L/PR:N (red, sin autenticación, baja complejidad) → T1190. CWE-20 y descripción de paquetes spoofados que causan DoS en CPU del SPC3 → T1499.004 (aplicación exhaustion).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-20
Referencias
JSON original (NVD)
Mostrar
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"value": "An Improper Input Validation vulnerability in the syslog stream TCP transport of Juniper Networks Junos OS on MX240, MX480 and MX960 devices with MX-SPC3 Security Services Card allows an unauthenticated, network-based attacker, to send specific spoofed packets to cause a CPU Denial of Service (DoS) to the MX-SPC3 SPUs.\n\nContinued receipt and processing of these specific packets will sustain the DoS condition.\n\nThis issue affects Junos OS: * All versions before 22.2R3-S6,\n * from 22.4 before 22.4R3-S4,\n * from 23.2 before 23.2R2-S3,\n * from 23.4 before 23.4R2-S4,\n * from 24.2 before 24.2R1-S2, 24.2R2\n\n\nAn indicator of compromise will indicate the SPC3 SPUs utilization has spiked.\n\n\nFor example: \n user@device> show services service-sets summary\n Service sets CPU\n Interface configured Bytes used Session bytes used Policy bytes used utilization\n \"interface\" 1 \"bytes\" (percent%) \"sessions\" (\"percent\"%) \"bytes\" (\"percent\"%) 99.97 % OVLD <<<<<< look for high CPU usage"
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