Junos OS: MX Series: Subscriber login/logout activity will lead to a memory leak

A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).

In a subscriber management scenario, login/logout activity triggers a memory leak, and the leaked memory gradually increments and eventually results in a crash.

user@host> show chassis fpc

Temp    CPU Utilization (%)   CPU Utilization (%)   Memory     Utilization (%)

Slot State       (C)     Total   Interrupt     1min   5min  15min    DRAM (MB)  Heap   Buffer

2 Online         36       10         0          9     8     9        32768      26         0

This issue affects Junos OS on MX Series:

* All versions before 21.2R3-S9

* from 21.4 before 21.4R3-S10

* from 22.2 before 22.2R3-S6

* from 22.4 before 22.4R3-S5

* from 23.2 before 23.2R2-S3

* from 23.4 before 23.4R2-S3

* from 24.2 before 24.2R2.