An Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Connectivity Fault Management(CFM) module of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600) allows an adjacent attacker on the local broadcast domain to cause a Denial of Service(DoS). Upon receiving a malformed CFM packet, the MPC crashes. Continued receipt of these packets causes a sustained denial of service. This issue can only be triggered when CFM hasn't been configured. This issue affects: Juniper Networks Junos OS All versions prior to 19.1R3-S10 on MX Series; 19.2 versions prior to 19.2R3-S7 on MX Series; 19.3 versions prior to 19.3R3-S8 on MX Series; 19.4 versions prior to 19.4R3-S12 on MX Series; 20.1 version 20.1R1 and later versions on MX Series; 20.2 versions
The following software releases have been updated to resolve this specific issue: Junos OS 19.1R3-S10, 19.2R3-S7, 19.4R3-S12, 20.2R3-S7, 20.4R3-S7, 21.1R3-S5, 21.2R3-S4, 21.3R3-S4, 21.4R3-S3, 22.1R3-S2, 22.2R3, 22.3R2, 22.3R3, 22.4R2, 23.1R1, and all subsequent releases.
There are no known workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=unspecified<19.1R3-S10 | 19.1R3-S10 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R3-S7 | 19.2R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S8 | 19.3R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R3-S12 | 19.4R3-S12 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1* | 20.1* | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R3-S7 | 20.2R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3* | 20.3* | advisory ↗ |
| Juniper Networks Junos OS | >=20.4<20.4R3-S7 | 20.4R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=21.2<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-S2 | 22.1R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=22.2<22.2R3 | 22.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.3<22.3R2 | 22.3R2 | advisory ↗ |
| Juniper Networks Junos OS | >=22.4<22.4R2 | 22.4R2 | advisory ↗ |