CVE-2026-57029
Severity CVSS v4.0:
MEDIUM
Type:
Unavailable / Other
Publication date:
09/07/2026
Last modified:
10/07/2026
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).<br />
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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.<br />
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This issue affects Junos OS Evolved on QFX Series:<br />
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* all 23.2 versions, <br />
* 23.4 versions before 23.4R2-S7-EVO,<br />
* 24.2 versions before 24.2R2-S5-EVO,<br />
* 24.4 versions before 24.4R2-S3-EVO,<br />
* 25.2 versions before 25.2R2-EVO.
Impact
Base Score 4.0
6.00
Severity 4.0
MEDIUM
Base Score 3.x
5.30
Severity 3.x
MEDIUM