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MEDIUM · 5.3

CVE-2026-57029

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)...

Vulnerability 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.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
JuniperJunos Os Evolved23.2
JuniperQfx10008-
JuniperQfx10016-
JuniperQfx5110-
JuniperQfx5120-
JuniperQfx5130-
JuniperQfx5140-
JuniperQfx5200-
JuniperQfx5210-
JuniperQfx5220-
JuniperQfx5230-64Cd-
JuniperQfx5240-
JuniperQfx5241-
JuniperQfx5250-
JuniperQfx5700-

Related Weaknesses (CWE)

CWE-820

References

FAQ

What is CVE-2026-57029?

CVE-2026-57029 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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)...

How severe is CVE-2026-57029?

CVE-2026-57029 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-57029?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos Os Evolved, Juniper Qfx10008, Juniper Qfx10016, Juniper Qfx5110, Juniper Qfx5120.