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CVE-2024-39550

Status: ModifiedHigh (7.1)—

A Missing Release of Memory after Effective Lifetime vulnerability in the rtlogd process of Juniper Networks Junos OS on MX Series with SPC3 allows an unauthenticated, adjacent attacker to trigger internal events cause ( which can be done by repeated port flaps) to cause a slow memory leak, ultimately leading to a Denial of Service (DoS).

Memory can only be recovered by manually restarting rtlogd process.  The memory usage can be monitored using the below command.

user@host> show system processes extensive | match rtlog

This issue affects Junos OS on MX Series with SPC3 line card:

Technical details traces, logs and code from the original report
  *  from 21.2R3 before 21.2R3-S8, 
  *  from 21.4R2 before 21.4R3-S6, 
  *  from 22.1 before 22.1R3-S5, 
  *  from 22.2 before 22.2R3-S3, 
  *  from 22.3 before 22.3R3-S2, 
  *  from 22.4 before 22.4R3-S1, 
  *  from 23.2 before 23.2R2, 
  *  from 23.4 before 23.4R2.

CVSS

Exploitation probability (EPSS)

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).

Affected technologies (1)

Juniper — Junos

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2024-39550",
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      "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the rtlogd process of Juniper Networks Junos OS on MX Series with SPC3 allows an unauthenticated, adjacent attacker to trigger internal events cause ( which can be done by repeated port flaps) to cause a slow memory leak, ultimately leading to a Denial of Service (DoS). \n\nMemory can only be recovered by manually restarting rtlogd process. \nThe memory usage can be monitored using the below command.\n\n    user@host> show system processes extensive | match rtlog \n\n\n\nThis issue affects Junos OS on MX Series with SPC3 line card: \n\n\n\n  *  from 21.2R3 before 21.2R3-S8, \n  *  from 21.4R2 before 21.4R3-S6, \n  *  from 22.1 before 22.1R3-S5, \n  *  from 22.2 before 22.2R3-S3, \n  *  from 22.3 before 22.3R3-S2, \n  *  from 22.4 before 22.4R3-S1, \n  *  from 23.2 before 23.2R2, \n  *  from 23.4 before 23.4R2."
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      "lang": "es",
      "value": "Una vulnerabilidad de liberación de memoria faltante después de la vida útil efectiva en el proceso rtlogd de Juniper Networks Junos OS en la serie MX con SPC3 permite que un atacante adyacente no autenticado desencadene una causa de eventos internos (que se puede lograr mediante solapas repetidas de puertos) para causar una pérdida de memoria lenta. , lo que en última instancia conduce a una denegación de servicio (DoS). La memoria sólo se puede recuperar reiniciando manualmente el proceso rtlogd. El uso de la memoria se puede monitorear usando el siguiente comando.     usuario@host> show system processes extensive | match rtlog Este problema afecta a Junos OS en la serie MX con tarjeta de línea SPC3: * desde 21.2R3 antes de 21.2R3-S8, * desde 21.4R2 antes de 21.4R3-S6, * desde 22.1 antes de 22.1R3-S5, * desde 22.2 antes de 22.2R3 -S3, * de 22.3 antes de 22.3R3-S2, * de 22.4 antes de 22.4R3-S1, * de 23.2 antes de 23.2R2, * de 23.4 antes de 23.4R2."
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  ],
  "lastModified": "2026-06-17T07:42:11.947",
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