Junos OS: SRX Series: When "tcp-encap" is configured and specific packets are received flowd will crash

A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX Series allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).

In a remote access VPN scenario, if a "tcp-encap-profile" is configured and a sequence of specific packets is received, a flowd crash and restart will be observed.

This issue affects Juniper Networks Junos OS on SRX Series:

* All versions earlier than 20.4R3-S8;

* 21.2 versions earlier than 21.2R3-S6;

* 21.3 versions earlier than 21.3R3-S5;

* 21.4 versions earlier than 21.4R3-S5;

* 22.1 versions earlier than 22.1R3-S3;

* 22.2 versions earlier than 22.2R3-S3;

* 22.3 versions earlier than 22.3R3-S1;

* 22.4 versions earlier than 22.4R2-S2, 22.4R3.