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CVE-2024-39536

Status: AnalyzedMedium (6)—

A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a

Denial-of-Service (DoS).

When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.

Whether the leak occurs can be monitored with the following CLI command:

Read full descriptionShow less

> show ppm request-queue

FPC     Pending-request fpc0                   2 request-total-pending: 2

where a continuously increasing number of pending requests is indicative of the leak.

This issue affects:

Junos OS:

Technical details traces, logs and code from the original report
  *  All versions before 21.2R3-S8,
  *  21.4 versions before 21.4R3-S7,
  *  22.1 versions before 22.1R3-S4,
  *  22.2 versions before 22.2R3-S4, 
  *  22.3 versions before 22.3R3,
  *  22.4 versions before 22.4R2-S2, 22.4R3.

Junos OS Evolved:
  *  All versions before 21.2R3-S8-EVO,
  *  21.4-EVO versions before 21.4R3-S7-EVO,
  *  22.2-EVO versions before 22.2R3-S4-EVO,
  *  22.3-EVO versions before 22.3R3-EVO,
  *  22.4-EVO versions before 22.4R3-EVO.

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 (2)

CWEs

References

Raw JSON (NVD)

Show
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      "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a \n\nDenial-of-Service (DoS).\n\n\nWhen a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.\n\n\n\nWhether the leak occurs can be monitored with the following CLI command:\n\n> show ppm request-queue\n\n\nFPC     Pending-request\nfpc0                   2\nrequest-total-pending: 2\n\n\nwhere a continuously increasing number of pending requests is indicative of the leak. \n\n\n\n\n\n\n\n\nThis issue affects:\n\nJunos OS:\n\n\n  *  All versions before 21.2R3-S8,\n  *  21.4 versions before 21.4R3-S7,\n  *  22.1 versions before 22.1R3-S4,\n  *  22.2 versions before 22.2R3-S4, \n  *  22.3 versions before 22.3R3,\n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\n\nJunos OS Evolved:\n  *  All versions before 21.2R3-S8-EVO,\n  *  21.4-EVO versions before 21.4R3-S7-EVO,\n  *  22.2-EVO versions before 22.2R3-S4-EVO,\n  *  22.3-EVO versions before 22.3R3-EVO,\n  *  22.4-EVO versions before 22.4R3-EVO."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de liberación de memoria faltante después de la vida útil efectiva en Periodic Packet Management Daemon (ppmd) de Juniper Networks Junos OS y Junos OS Evolved permite que un atacante adyacente no autenticado provoque una denegación de servicio (DoS). Cuando una sesión BFD se configura con solapas de autenticación, la memoria ppmd puede perderse. Que se produzca la fuga depende de una condición de ejecución que está fuera del control de los atacantes. Este problema solo afecta a BFD que opera en modo distribuido, también conocido como delegado (que es el comportamiento predeterminado) o en línea. Si se produce la fuga se puede monitorear con el siguiente comando CLI: > show ppm request-queue FPC Pending-request fpc0 2 request-total-pending: 2 donde un número continuamente creciente de solicitudes pendientes es indicativo de la fuga. Este problema afecta a: Junos OS: * Todas las versiones anteriores a 21.2R3-S8, * Versiones 21.4 anteriores a 21.4R3-S7, * Versiones 22.1 anteriores a 22.1R3-S4, * Versiones 22.2 anteriores a 22.2R3-S4, * Versiones 22.3 anteriores a 22.3R3, * Versiones 22.4 anteriores a 22.4R2-S2, 22.4R3, * Versiones 23.1 anteriores a 23.1R2. Junos OS Evolved: * Todas las versiones anteriores a 21.2R3-S8-EVO, * Versiones 21.4-EVO anteriores a 21.4R3-S7-EVO, * Versiones 22.2-EVO anteriores a 22.2R3-S4-EVO, * Versiones 22.3-EVO anteriores a 22.3R3- EVO, *versiones 22.4-EVO anteriores a 22.4R3-EVO, *versiones 23.2-EVO anteriores a 23.2R1-EVO."
    }
  ],
  "lastModified": "2026-06-17T07:42:09.340",
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