When a MX Series is configured as a Broadband Network Gateway (BNG) based on Layer 2 Tunneling Protocol (L2TP), executing certain CLI command may cause the system to run out of disk space, excessive disk usage may cause other complications. An administrator can use the following CLI command to monitor the available disk space: user@device> show system storage Filesystem Size Used Avail Capacity Mounted on /dev/gpt/junos 19G 18G 147M 99% /.mount <<<<< running out of space tmpfs 21G 16K 21G 0% /.mount/tmp tmpfs 5.3G 1.7M 5.3G 0% /.mount/mfs This issue affects Juniper Networks Junos OS on MX Series: 17.3R1 and later versions prior to 17.4R3-S5, 18.1 versions prior to 18.1R3-S13, 18.2 versions prior to 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S7; 19.1 versions
The following software releases have been updated to resolve this specific issue: 17.4R3-S5, 18.1R3-S13, 18.2R3-S7, 18.3R3-S4, 18.4R3-S7, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1-S1, 20.4R2, 21.1R1, and all subsequent releases. If impacted, issue is recoverable after restarting the jl2tpd daemon: user@device> restart l2tp-universal-edge
There are no viable workarounds for this issue. To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to the CLI only trusted administrative networks, hosts and users.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.3R1<17.3* | 17.3* | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R3-S5 | 17.4R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S13 | 18.1R3-S13 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R3-S7 | 18.2R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S4 | 18.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R3-S7 | 18.4R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R3-S4 | 19.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R1-S6, 19.2R3-S2 | 19.2R1-S6, 19.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S2 | 19.3R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R2-S4, 19.4R3-S2 | 19.4R2-S4, 19.4R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R3 | 20.1R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R2-S3, 20.2R3 | 20.2R2-S3, 20.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R2 | 20.3R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.4<20.4R1-S1, 20.4R2 | 20.4R1-S1, 20.4R2 | advisory ↗ |