QID 44162

Juniper Junos is the network operating system used in Juniper Networks hardware systems.

An Improper Check for Unusual or Exceptional Conditions vulnerability in the kernel of Juniper Network Junos OS on MX Series allows a network based attacker with low privileges to cause a denial of service.
If a scaled configuration for Source class usage (SCU) / destination class usage (DCU) (more than 10 route classes) is present and the SCU/DCU statistics are gathered by executing specific SNMP requests or CLI commands, a vmcore for the RE kernel will be seen which leads to a device restart. Continued exploitation of this issue will lead to a sustained DoS.

Note: To be exposed to this issue a scaled SCU/DCU configuration with more than 10 classes needs to be present on the device, please check advisory for more info.

This issue only affects MX Series devices with MPC10, MPC11 or LC9600, and MX304.
All versions earlier than 20.4R3-S9
21.2 versions earlier than 21.2R3-S6
21.3 versions earlier than 21.3R3-S5
21.4 versions earlier than 21.4R3
22.1 versions earlier than 22.1R3
22.2 versions earlier than 22.2R2
22.3 versions earlier than 22.3R2

QID detection logic: (Authenticated)

It checks for vulnerable Junos OS version.

Successful exploitation of this vulnerability allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.