CVE-2026-57029
Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash
- State
- Published
- Severity
- 6.0 Medium
- Published
- Jul 9, 2026
- Updated
- Jul 10, 2026
- Reserved
- Jun 23, 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).
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 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 | juniper |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | juniper |
Weaknesses
- CWE-820 Missing Synchronization
Affected Products
| Product | Versions |
|---|---|
Junos OS EvolvedJuniper Networks |
|
References
- https://supportportal.juniper.net/JSA110089vendor-advisory
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