An Improper Release of Memory Before Removing Last Reference vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a local, low privileged attacker to cause an FPC crash, leading to Denial of Service (DoS). On all Junos MX Series with MPC1 - MPC9, LC480, LC2101, MX10003, and MX80, when Connectivity-Fault-Management (CFM) is enabled in a VPLS scenario, and a specific LDP related command is run, an FPC will crash and reboot. Continued execution of this specific LDP command can lead to sustained Denial of Service condition. This issue affects: Juniper Networks Junos OS on MX Series: * All versions prior to 20.4R3-S7; * 21.1 versions prior to 21.1R3-S5; * 21.2 versions prior to 21.2R3-S4; * 21.3 versions prior to 21.3R3-S4; * 21.4 versions pr
The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S7, 21.1R3-S5, 21.2R3-S4, 21.3R3-S4, 21.4R3-S3, 22.1R3-S1, 22.2R2-S1, 22.2R3, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.
This issue can be avoided by disabling CFM MIP functionality. [ protocols oam ethernet connectivity-fault-management maintenance-domain mip-half-function none ]
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | <20.4R3-S7 | 20.4R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=21.1<21.1R3-S5 | 21.1R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=21.2<21.2R3-S4 | 21.2R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=21.3<21.3R3-S4 | 21.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=21.4<21.4R3-S3 | 21.4R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.1<22.1R3-S1 | 22.1R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=22.2<22.2R2-S1, 22.2R3 | 22.2R2-S1, 22.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.3<22.3R1-S2, 22.3R2 | 22.3R1-S2, 22.3R2 | advisory ↗ |