A Missing Release of Memory after Effective Lifetime vulnerability in the kernel of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In an MPLS scenario specific packets destined to an Integrated Routing and Bridging (irb) interface of the device will cause a buffer (mbuf) to leak. Continued receipt of these specific packets will eventually cause a loss of connectivity to and from the device, and requires a reboot to recover. These mbufs can be monitored by using the CLI command 'show system buffers': user@host> show system buffers 783/1497/2280 mbufs in use (current/cache/total) user@host> show system buffers 793/1487/2280 mbufs in use (current/cache/total) <<<<<< mbuf usage increased This issue affects Juniper Networks Junos OS: All versions prior to 19.3R3-S7.

19.4 versions prior to 19.4R3-S9.

20.1 version 20.1R1 and later versions.

20.2 versions prior to 20.2R3-S5.

20.3 versions prior to 20.3R3-S5.

20.4 versions prior to 20.4R3-S4.

21.1 versions prior to 21.1R3-S3.

21.2 versions prior to 21.2R3-S2.

21.3 versions prior to 21.3R3-S1.

21.4 versions prior to 21.4R3.

22.1 versions prior to 22.1R2.