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Medium severity5.3NVD Advisory· Published Jul 9, 2026· Updated Jul 13, 2026

CVE-2026-57029

CVE-2026-57029

Description

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.

Affected products

32
  • Juniper Networks/OS Evolvedllm-fuzzy32 versions
    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+ 31 more
    • (no CPE)range: 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
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:*:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

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