CVE-2026-57029 (GCVE-0-2026-57029)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:12 – Updated: 2026-07-10 14:45
VLAI
Title
Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash
Summary
A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS). When the reachability of an sFlow collector changes, the corresponding next-hop entry is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed. This issue affects Junos OS Evolved on QFX Series: * all 23.2 versions,  * 23.4 versions before 23.4R2-S7-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S3-EVO, * 25.2 versions before 25.2R2-EVO.
Severity
5.3 (Medium)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
6 (Medium)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/RE:M
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 14:44 UTC
CWE
  • CWE-820 - Missing Synchronization
Assigner
juniper CNA under the mitre root
CNA scorecard B 84/100 over 193 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Evolved Affected: 0 , < 23.4R2-S7-EVO (custom)
Affected: 24.2 , < 24.2R2-S5-EVO (custom)
Affected: 24.4 , < 24.4R2-S3-EVO (custom)
Affected: 25.2 , < 25.2R2-EVO (custom)
guessed Create a notification for this product.
Date Public
2026-07-08 16:00
Show details on NVD website
To clipboard 

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            "value": "A\u00a0Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS).\n\n\nWhen the reachability of an sFlow collector changes, the corresponding next-hop entry is updated.\u00a0If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed.\n\n\n\n\nThis issue affects Junos OS Evolved on QFX Series:\n\n\n  *  all 23.2 versions,\u00a0\n  *  23.4 versions before 23.4R2-S7-EVO,\n  *  24.2 versions before 24.2R2-S5-EVO,\n  *  24.4 versions before 24.4R2-S3-EVO,\n  *  25.2 versions before 25.2R2-EVO."
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            "value": "Una vulnerabilidad de sincronizaci\u00f3n faltante en el gestor del colector de flujo de Juniper Networks Junos OS Evolved en la serie QFX permite a un atacante adyacente y no autenticado causar una denegaci\u00f3n de servicio (DoS).\n\nCuando cambia la accesibilidad de un colector sFlow, la entrada de siguiente salto correspondiente se actualiza. Si esta actualizaci\u00f3n ocurre simult\u00e1neamente con el hilo sFlow accediendo a los datos del siguiente salto (lo cual est\u00e1 fuera del control del atacante), causa que el proceso evo-pfemand falle, impactando todo el reenv\u00edo de tr\u00e1fico hasta que se haya completado el reinicio autom\u00e1tico del proceso.\n\nEste problema afecta a Junos OS Evolved en la serie QFX:\n\n  *  todas las versiones 23.2,\n  *  versiones 23.4 anteriores a 23.4R2-S7-EVO,\n  *  versiones 24.2 anteriores a 24.2R2-S5-EVO,\n  *  versiones 24.4 anteriores a 24.4R2-S3-EVO,\n  *  versiones 25.2 anteriores a 25.2R2-EVO."
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