An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). If a high rate of specific valid packets are processed by the routing engine (RE) this will lead to a loss of connectivity of the RE with other components of the chassis and thereby a complete and persistent system outage. Please note that a carefully designed lo0 firewall filter will block or limit these packets which should prevent this issue from occurring. The following log messages can be seen when this issue occurs: <host> kernel: nf_conntrack: nf_conntrack: table full, dropping packet This issue affects Juniper Networks Junos OS Evolved: * All versions earlier than 20.4
The following software releases have been updated to resolve this specific issue: Junos OS Evolved 20.4R3-S7-EVO, 21.4R3-S5-EVO, 22.1R3-S2-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.
To prevent the device from receiving high rates of valid traffic please configure firewall filters to block unexpected and even throttle expected traffic.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS Evolved | <20.4R3-S7-EVO | 20.4R3-S7-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=21.2-EVO<21.2*-EVO | 21.2*-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=21.4-EVO<21.4R3-S5-EVO | 21.4R3-S5-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.1-EVO<22.1R3-S2-EVO | 22.1R3-S2-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.2-EVO<22.2R3-EVO | 22.2R3-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.3-EVO<22.3R2-EVO | 22.3R2-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.4-EVO<22.4R2-EVO | 22.4R2-EVO | advisory ↗ |