An Improper Check for Unusual or Exceptional Conditions vulnerability in the bbe-smgd of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In a Broadband Edge / Subscriber Management scenario on MX Series when a specifically malformed ICMP packet addressed to the device is received from a subscriber the bbe-smgd will crash, affecting the subscriber sessions that are connecting, updating, or terminating. Continued receipt of such packets will lead to a sustained DoS condition. When this issue happens the below log can be seen if the traceoptions for the processes smg-service are enabled: BBE_TRACE(TRACE_LEVEL_INFO, "%s: Dropped unsupported ICMP PKT ... This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 19.4R3-S11.

20.2 versions prior to 20.2R3-S7.

20.3 versions prior to 20.3R3-S6.

20.4 versions prior to 20.4R3-S6.

21.1 versions prior to 21.1R3-S4.

21.2 versions prior to 21.2R3-S4.

21.3 versions prior to 21.3R3-S3.

21.4 versions prior to 21.4R3-S2.

22.1 versions prior to 22.1R2-S2, 22.1R3.

22.2 versions prior to 22.2R2.

22.3 versions prior to 22.3R1-S2, 22.3R2.