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.
Published: 2026-07-09
Score: 6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.


Vendor Workaround

There are no known workarounds for this issue.

Tracking

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Advisories

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History

Sat, 11 Jul 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 09 Jul 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks junos Os Evolved
Vendors & Products Juniper Networks
Juniper Networks junos Os Evolved

Thu, 09 Jul 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash
Weaknesses CWE-820
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6, 'vector': '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'}


Subscriptions

Juniper Junos Os Evolved Qfx10008 Qfx10016 Qfx5110 Qfx5120 Qfx5130 Qfx5140 Qfx5200 Qfx5210 Qfx5220 Qfx5230-64cd Qfx5240 Qfx5241 Qfx5250 Qfx5700
Juniper Networks Junos Os Evolved
cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-07-10T14:45:20.380Z

Reserved: 2026-06-23T16:27:00.249Z

Link: CVE-2026-57029

cve-icon Vulnrichment

Updated: 2026-07-10T14:45:16.218Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-09T22:17:08.453

Modified: 2026-07-13T20:23:46.113

Link: CVE-2026-57029

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T14:00:06Z

Weaknesses