On Juniper Networks EX4300 Series, receipt of a stream of specific IPv4 packets can cause Routing Engine (RE) high CPU load, which could lead to network protocol operation issue and traffic interruption. This specific packets can originate only from within the broadcast domain where the device is connected. This issue occurs when the packets enter to the IRB interface. Only IPv4 packets can trigger this issue. IPv6 packets cannot trigger this issue. This issue affects Juniper Networks Junos OS on EX4300 series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R3-S4; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R2-S4, 18.4R3-S2; 19.1 versions prior to 19.1R2-S2, 19.1R3-S1; 19.2 versions prior to 19.2R1-S5, 19.2R2-S1, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S3, 20.1R2.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | 17.3 (including) | 17.3 (including) |
| Junos | Juniper | 17.3-r1-s1 (including) | 17.3-r1-s1 (including) |
| Junos | Juniper | 17.3-r2 (including) | 17.3-r2 (including) |
| Junos | Juniper | 17.3-r2-s1 (including) | 17.3-r2-s1 (including) |
| Junos | Juniper | 17.3-r2-s2 (including) | 17.3-r2-s2 (including) |
| Junos | Juniper | 17.3-r2-s3 (including) | 17.3-r2-s3 (including) |
| Junos | Juniper | 17.3-r2-s4 (including) | 17.3-r2-s4 (including) |
| Junos | Juniper | 17.3-r2-s5 (including) | 17.3-r2-s5 (including) |
| Junos | Juniper | 17.3-r3 (including) | 17.3-r3 (including) |
| Junos | Juniper | 17.3-r3-s1 (including) | 17.3-r3-s1 (including) |
| Junos | Juniper | 17.3-r3-s2 (including) | 17.3-r3-s2 (including) |
| Junos | Juniper | 17.3-r3-s3 (including) | 17.3-r3-s3 (including) |
| Junos | Juniper | 17.3-r3-s4 (including) | 17.3-r3-s4 (including) |
| Junos | Juniper | 17.3-r3-s7 (including) | 17.3-r3-s7 (including) |
| Junos | Juniper | 17.3-r3-s8 (including) | 17.3-r3-s8 (including) |
| Junos | Juniper | 17.4 (including) | 17.4 (including) |
| Junos | Juniper | 17.4-r1 (including) | 17.4-r1 (including) |
| Junos | Juniper | 17.4-r1-s1 (including) | 17.4-r1-s1 (including) |
| Junos | Juniper | 17.4-r1-s2 (including) | 17.4-r1-s2 (including) |
| Junos | Juniper | 17.4-r1-s4 (including) | 17.4-r1-s4 (including) |
| Junos | Juniper | 17.4-r1-s5 (including) | 17.4-r1-s5 (including) |
| Junos | Juniper | 17.4-r1-s6 (including) | 17.4-r1-s6 (including) |
| Junos | Juniper | 17.4-r1-s7 (including) | 17.4-r1-s7 (including) |
| Junos | Juniper | 17.4-r2 (including) | 17.4-r2 (including) |
| Junos | Juniper | 17.4-r2-s1 (including) | 17.4-r2-s1 (including) |
| Junos | Juniper | 17.4-r2-s10 (including) | 17.4-r2-s10 (including) |
| Junos | Juniper | 17.4-r2-s2 (including) | 17.4-r2-s2 (including) |
| Junos | Juniper | 17.4-r2-s3 (including) | 17.4-r2-s3 (including) |
| Junos | Juniper | 17.4-r2-s4 (including) | 17.4-r2-s4 (including) |
| Junos | Juniper | 17.4-r2-s5 (including) | 17.4-r2-s5 (including) |
| Junos | Juniper | 17.4-r2-s6 (including) | 17.4-r2-s6 (including) |
| Junos | Juniper | 17.4-r2-s7 (including) | 17.4-r2-s7 (including) |
| Junos | Juniper | 17.4-r2-s8 (including) | 17.4-r2-s8 (including) |
| Junos | Juniper | 17.4-r2-s9 (including) | 17.4-r2-s9 (including) |
| Junos | Juniper | 18.1 (including) | 18.1 (including) |
| Junos | Juniper | 18.1-r1 (including) | 18.1-r1 (including) |
| Junos | Juniper | 18.1-r2 (including) | 18.1-r2 (including) |
| Junos | Juniper | 18.1-r2-s1 (including) | 18.1-r2-s1 (including) |
| Junos | Juniper | 18.1-r2-s2 (including) | 18.1-r2-s2 (including) |
| Junos | Juniper | 18.1-r2-s4 (including) | 18.1-r2-s4 (including) |
| Junos | Juniper | 18.1-r3 (including) | 18.1-r3 (including) |
| Junos | Juniper | 18.1-r3-s1 (including) | 18.1-r3-s1 (including) |
| Junos | Juniper | 18.1-r3-s2 (including) | 18.1-r3-s2 (including) |
| Junos | Juniper | 18.1-r3-s3 (including) | 18.1-r3-s3 (including) |
| Junos | Juniper | 18.1-r3-s4 (including) | 18.1-r3-s4 (including) |
| Junos | Juniper | 18.1-r3-s6 (including) | 18.1-r3-s6 (including) |
| Junos | Juniper | 18.1-r3-s7 (including) | 18.1-r3-s7 (including) |
| Junos | Juniper | 18.1-r3-s8 (including) | 18.1-r3-s8 (including) |
| Junos | Juniper | 18.1-r3-s9 (including) | 18.1-r3-s9 (including) |
| Junos | Juniper | 18.2 (including) | 18.2 (including) |
| Junos | Juniper | 18.2-r1 (including) | 18.2-r1 (including) |
| Junos | Juniper | 18.2-r1-s3 (including) | 18.2-r1-s3 (including) |
| Junos | Juniper | 18.2-r1-s4 (including) | 18.2-r1-s4 (including) |
| Junos | Juniper | 18.2-r1-s5 (including) | 18.2-r1-s5 (including) |
| Junos | Juniper | 18.2-r2 (including) | 18.2-r2 (including) |
| Junos | Juniper | 18.2-r2-s1 (including) | 18.2-r2-s1 (including) |
| Junos | Juniper | 18.2-r2-s2 (including) | 18.2-r2-s2 (including) |
| Junos | Juniper | 18.2-r2-s3 (including) | 18.2-r2-s3 (including) |
| Junos | Juniper | 18.2-r2-s4 (including) | 18.2-r2-s4 (including) |
| Junos | Juniper | 18.2-r2-s5 (including) | 18.2-r2-s5 (including) |
| Junos | Juniper | 18.2-r2-s6 (including) | 18.2-r2-s6 (including) |
| Junos | Juniper | 18.2-r3 (including) | 18.2-r3 (including) |
| Junos | Juniper | 18.2-r3-s1 (including) | 18.2-r3-s1 (including) |
| Junos | Juniper | 18.2-r3-s2 (including) | 18.2-r3-s2 (including) |
| Junos | Juniper | 18.2-r3-s3 (including) | 18.2-r3-s3 (including) |
| Junos | Juniper | 18.3 (including) | 18.3 (including) |
| Junos | Juniper | 18.3-r1 (including) | 18.3-r1 (including) |
| Junos | Juniper | 18.3-r1-s1 (including) | 18.3-r1-s1 (including) |
| Junos | Juniper | 18.3-r1-s2 (including) | 18.3-r1-s2 (including) |
| Junos | Juniper | 18.3-r1-s3 (including) | 18.3-r1-s3 (including) |
| Junos | Juniper | 18.3-r1-s5 (including) | 18.3-r1-s5 (including) |
| Junos | Juniper | 18.3-r1-s6 (including) | 18.3-r1-s6 (including) |
| Junos | Juniper | 18.3-r2 (including) | 18.3-r2 (including) |
| Junos | Juniper | 18.3-r2-s1 (including) | 18.3-r2-s1 (including) |
| Junos | Juniper | 18.3-r2-s2 (including) | 18.3-r2-s2 (including) |
| Junos | Juniper | 18.3-r2-s3 (including) | 18.3-r2-s3 (including) |
| Junos | Juniper | 18.3-r3 (including) | 18.3-r3 (including) |
| Junos | Juniper | 18.3-r3-s1 (including) | 18.3-r3-s1 (including) |
| Junos | Juniper | 18.4 (including) | 18.4 (including) |
| Junos | Juniper | 18.4-r1 (including) | 18.4-r1 (including) |
| Junos | Juniper | 18.4-r1-s1 (including) | 18.4-r1-s1 (including) |
| Junos | Juniper | 18.4-r1-s2 (including) | 18.4-r1-s2 (including) |
| Junos | Juniper | 18.4-r1-s5 (including) | 18.4-r1-s5 (including) |
| Junos | Juniper | 18.4-r1-s6 (including) | 18.4-r1-s6 (including) |
| Junos | Juniper | 18.4-r2 (including) | 18.4-r2 (including) |
| Junos | Juniper | 18.4-r2-s1 (including) | 18.4-r2-s1 (including) |
| Junos | Juniper | 18.4-r2-s2 (including) | 18.4-r2-s2 (including) |
| Junos | Juniper | 18.4-r2-s3 (including) | 18.4-r2-s3 (including) |
| Junos | Juniper | 18.4-r3 (including) | 18.4-r3 (including) |
| Junos | Juniper | 18.4-r3-s1 (including) | 18.4-r3-s1 (including) |
| Junos | Juniper | 19.1 (including) | 19.1 (including) |
| Junos | Juniper | 19.1-r1 (including) | 19.1-r1 (including) |
| Junos | Juniper | 19.1-r1-s1 (including) | 19.1-r1-s1 (including) |
| Junos | Juniper | 19.1-r1-s2 (including) | 19.1-r1-s2 (including) |
| Junos | Juniper | 19.1-r1-s3 (including) | 19.1-r1-s3 (including) |
| Junos | Juniper | 19.1-r1-s4 (including) | 19.1-r1-s4 (including) |
| Junos | Juniper | 19.1-r2 (including) | 19.1-r2 (including) |
| Junos | Juniper | 19.1-r2-s1 (including) | 19.1-r2-s1 (including) |
| Junos | Juniper | 19.1-r3 (including) | 19.1-r3 (including) |
| Junos | Juniper | 19.2 (including) | 19.2 (including) |
| Junos | Juniper | 19.2-r1 (including) | 19.2-r1 (including) |
| Junos | Juniper | 19.2-r1-s1 (including) | 19.2-r1-s1 (including) |
| Junos | Juniper | 19.2-r1-s2 (including) | 19.2-r1-s2 (including) |
| Junos | Juniper | 19.2-r1-s3 (including) | 19.2-r1-s3 (including) |
| Junos | Juniper | 19.2-r1-s4 (including) | 19.2-r1-s4 (including) |
| Junos | Juniper | 19.2-r2 (including) | 19.2-r2 (including) |
| Junos | Juniper | 19.3 (including) | 19.3 (including) |
| Junos | Juniper | 19.3-r1 (including) | 19.3-r1 (including) |
| Junos | Juniper | 19.3-r1-s1 (including) | 19.3-r1-s1 (including) |
| Junos | Juniper | 19.3-r2 (including) | 19.3-r2 (including) |
| Junos | Juniper | 19.3-r2-s1 (including) | 19.3-r2-s1 (including) |
| Junos | Juniper | 19.3-r2-s2 (including) | 19.3-r2-s2 (including) |
| Junos | Juniper | 19.3-r2-s3 (including) | 19.3-r2-s3 (including) |
| Junos | Juniper | 19.4-r1 (including) | 19.4-r1 (including) |
| Junos | Juniper | 19.4-r1-s1 (including) | 19.4-r1-s1 (including) |
| Junos | Juniper | 19.4-r1-s2 (including) | 19.4-r1-s2 (including) |
| Junos | Juniper | 20.1-r1 (including) | 20.1-r1 (including) |
| Junos | Juniper | 20.1-r1-s1 (including) | 20.1-r1-s1 (including) |
| Junos | Juniper | 20.1-r1-s2 (including) | 20.1-r1-s2 (including) |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.