A Missing Synchronization vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on ACX5448 and ACX710 allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).

If an interface flaps while the system gathers statistics on that interface, two processes simultaneously access a shared resource which leads to a PFE crash and restart.

This issue affects Junos OS:

All versions before 20.4R3-S9,

21.2 versions before 21.2R3-S5, 

21.3 versions before 21.3R3-S5, 

21.4 versions before 21.4R3-S4,

22.1 versions before 22.1R3-S2,

22.2 versions before 22.2R3-S2,

22.3 versions before 22.3R2-S2, 22.3R3,

22.4 versions before 22.4R2.

Juniper Networks, Inc. AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Juniper Networks, Inc. CWE-820

Juniper Networks, Inc. http://supportportal.juniper.net/JSA79187 [No types assigned]

Juniper Networks, Inc. https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N [No types assigned]