CVE-2025-21594
Status: AnalyzedHigh (8.7)—
An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series causes a port within a pool to be blocked leading to Denial of Service (DoS).
In a DS-Lite (Dual-Stack Lite) and NAT (Network Address Translation) scenario, when crafted IPv6 traffic is received and prefix-length is set to 56, the ports assigned to the user will not be freed. Eventually, users cannot establish new connections. Affected FPC/PIC need to be manually restarted to recover. Following is the command to identify the issue:
user@host> show services nat source port-block Host_IP External_IP Port_Block Ports_Used/ Block_State/ Range Ports_Total Left_Time(s) 2001:: x.x.x.x 58880-59391 256/256*1 Active/- >>>>>>>>port still usedThis issue affects Junos OS on MX Series:
Read full descriptionShow less
This issue does not affect versions before 20.2R1.
Technical details traces, logs and code from the original report
* from 21.2 before 21.2R3-S8, * from 21.4 before 21.4R3-S7, * from 22.1 before 22.1R3-S6, * from 22.2 before 22.2R3-S4, * from 22.3 before 22.3R3-S3, * from 22.4 before 22.4R3-S2, * from 23.2 before 23.2R2-S1, * from 23.4 before 23.4R1-S2, 23.4R2.
CVSS
- Version: 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:X/R:U/V:X/RE:X/U:X
- Base score: 8.7
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.42%
- Percentile among all scored CVEs: 34
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
🎯 ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1190Exploit Public-Facing Applicationinitial access60 % - Primary impact
T1499Endpoint Denial of Serviceimpact55 %
Inferred by deterministic rules from the CVSS vector and CWE. Indicative only.
🛡️ ATT&CK mitigations that cover these techniques
Affected technologies (1)
CWEs
- CWE-754
References
Raw JSON (NVD)
Show
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"value": "An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series causes a port within a pool to be blocked leading to Denial of Service (DoS).\n\nIn a DS-Lite (Dual-Stack Lite) and NAT (Network Address Translation) scenario, when crafted IPv6 traffic is received and prefix-length is set to 56, the ports assigned to the user will not be freed. Eventually, users cannot establish new connections. Affected FPC/PIC need to be manually restarted to recover.\nFollowing is the command to identify the issue: \n\n\n user@host> show services nat source port-block \n Host_IP External_IP Port_Block Ports_Used/ Block_State/\n Range Ports_Total Left_Time(s)\n 2001:: x.x.x.x 58880-59391 256/256*1 Active/- >>>>>>>>port still usedThis issue affects Junos OS on MX Series: \n\n * from 21.2 before 21.2R3-S8, \n * from 21.4 before 21.4R3-S7, \n * from 22.1 before 22.1R3-S6, \n * from 22.2 before 22.2R3-S4, \n * from 22.3 before 22.3R3-S3, \n * from 22.4 before 22.4R3-S2, \n * from 23.2 before 23.2R2-S1, \n * from 23.4 before 23.4R1-S2, 23.4R2.\n\n\nThis issue does not affect versions before 20.2R1."
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"value": "Una vulnerabilidad de Comprobación Incorrecta de Condiciones Inusuales o Excepcionales en el motor de reenvío de paquetes (pfe) de Juniper Networks Junos OS en la serie MX provoca el bloqueo de un puerto dentro de un pool, lo que provoca una denegación de servicio (DoS). En un escenario de DS-Lite (Dual-Stack Lite) y NAT (Traducción de Direcciones de Red), al recibir tráfico IPv6 manipulado y con una longitud de prefijo de 56, los puertos asignados al usuario no se liberan. Finalmente, los usuarios no pueden establecer nuevas conexiones. El FPC/PIC afectado debe reiniciarse manualmente para recuperarse. A continuación se muestra el comando para identificar el problema: user@host> show services nat source port-block ????Host_IP External_IP Port_Block Ports_Used/ Block_State/ Range Ports_Total Left_Time(s) ????2001:: x.x.x.x 58880-59391 256/256*1 Active/- >>>>>>>>port still used Este problema afecta a Junos OS en la serie MX: * desde 21.2 antes de 21.2R3-S8, * desde 21.4 antes de 21.4R3-S7, * desde 22.1 antes de 22.1R3-S6, * desde 22.2 antes de 22.2R3-S4, * desde 22.3 antes de 22.3R3-S3, * desde 22.4 antes de 22.4R3-S2, * desde 23.2 antes de 23.2R2-S1, * desde 23.4 anteriores a 23.4R1-S2 y 23.4R2. Este problema no afecta a las versiones anteriores a 20.2R1."
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],
"lastModified": "2026-06-17T08:43:48.513",
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