A Denial of Service (DoS) vulnerability in the processing of a flood of specific ARP traffic in Juniper Networks Junos OS on the EX4300 switch, sent from the local broadcast domain, may allow an unauthenticated network-adjacent attacker to trigger a PFEMAN watchdog timeout, causing the Packet Forwarding Engine (PFE) to crash and restart. After the restart, transit traffic will be temporarily interrupted until the PFE is reprogrammed. In a virtual chassis (VC), the impacted Flexible PIC Concentrator (FPC) may split from the VC temporarily, and join back into the VC once the PFE restarts. Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on the EX4300: All versions prior to 15.1R7-S12; 18.4 versions prior to 18.4R2-S10, 18.4R3-S11; 19.1 versions prior to 19.1R3-S8; 19.2 versions prior to 19.2R1-S9, 19.2R3-S4; 19.3 versions prior to 19.3R3-S5; 19.4 versions prior to 19.4R2-S6, 19.4R3-S7; 20.1 versions prior to 20.1R3-S3; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S2; 20.4 versions prior to 20.4R3-S1; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2-S1, 21.2R3; 21.3 versions prior to 21.3R1-S2, 21.3R2.
The product’s resource pool is not large enough to handle peak demand, which allows an attacker to prevent others from accessing the resource by using a (relatively) large number of requests for resources.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | * | 15.1 (excluding) |
| Junos | Juniper | 15.1 (including) | 15.1 (including) |
| Junos | Juniper | 15.1-a1 (including) | 15.1-a1 (including) |
| Junos | Juniper | 15.1-f (including) | 15.1-f (including) |
| Junos | Juniper | 15.1-f1 (including) | 15.1-f1 (including) |
| Junos | Juniper | 15.1-f2 (including) | 15.1-f2 (including) |
| Junos | Juniper | 15.1-f2-s1 (including) | 15.1-f2-s1 (including) |
| Junos | Juniper | 15.1-f2-s2 (including) | 15.1-f2-s2 (including) |
| Junos | Juniper | 15.1-f2-s3 (including) | 15.1-f2-s3 (including) |
| Junos | Juniper | 15.1-f2-s4 (including) | 15.1-f2-s4 (including) |
| Junos | Juniper | 15.1-f3 (including) | 15.1-f3 (including) |
| Junos | Juniper | 15.1-f4 (including) | 15.1-f4 (including) |
| Junos | Juniper | 15.1-f5 (including) | 15.1-f5 (including) |
| Junos | Juniper | 15.1-f5-s7 (including) | 15.1-f5-s7 (including) |
| Junos | Juniper | 15.1-f6 (including) | 15.1-f6 (including) |
| Junos | Juniper | 15.1-f6-s1 (including) | 15.1-f6-s1 (including) |
| Junos | Juniper | 15.1-f6-s10 (including) | 15.1-f6-s10 (including) |
| Junos | Juniper | 15.1-f6-s12 (including) | 15.1-f6-s12 (including) |
| Junos | Juniper | 15.1-f6-s2 (including) | 15.1-f6-s2 (including) |
| Junos | Juniper | 15.1-f6-s3 (including) | 15.1-f6-s3 (including) |
| Junos | Juniper | 15.1-f6-s4 (including) | 15.1-f6-s4 (including) |
| Junos | Juniper | 15.1-f6-s5 (including) | 15.1-f6-s5 (including) |
| Junos | Juniper | 15.1-f6-s6 (including) | 15.1-f6-s6 (including) |
| Junos | Juniper | 15.1-f6-s7 (including) | 15.1-f6-s7 (including) |
| Junos | Juniper | 15.1-f6-s8 (including) | 15.1-f6-s8 (including) |
| Junos | Juniper | 15.1-f6-s9 (including) | 15.1-f6-s9 (including) |
| Junos | Juniper | 15.1-f7 (including) | 15.1-f7 (including) |
| Junos | Juniper | 15.1-r (including) | 15.1-r (including) |
| Junos | Juniper | 15.1-r1 (including) | 15.1-r1 (including) |
| Junos | Juniper | 15.1-r2 (including) | 15.1-r2 (including) |
| Junos | Juniper | 15.1-r3 (including) | 15.1-r3 (including) |
| Junos | Juniper | 15.1-r4 (including) | 15.1-r4 (including) |
| Junos | Juniper | 15.1-r4-s7 (including) | 15.1-r4-s7 (including) |
| Junos | Juniper | 15.1-r4-s8 (including) | 15.1-r4-s8 (including) |
| Junos | Juniper | 15.1-r4-s9 (including) | 15.1-r4-s9 (including) |
| Junos | Juniper | 15.1-r5 (including) | 15.1-r5 (including) |
| Junos | Juniper | 15.1-r5-s1 (including) | 15.1-r5-s1 (including) |
| Junos | Juniper | 15.1-r5-s3 (including) | 15.1-r5-s3 (including) |
| Junos | Juniper | 15.1-r5-s5 (including) | 15.1-r5-s5 (including) |
| Junos | Juniper | 15.1-r5-s6 (including) | 15.1-r5-s6 (including) |
| Junos | Juniper | 15.1-r6 (including) | 15.1-r6 (including) |
| Junos | Juniper | 15.1-r6-s1 (including) | 15.1-r6-s1 (including) |
| Junos | Juniper | 15.1-r6-s2 (including) | 15.1-r6-s2 (including) |
| Junos | Juniper | 15.1-r6-s3 (including) | 15.1-r6-s3 (including) |
| Junos | Juniper | 15.1-r6-s4 (including) | 15.1-r6-s4 (including) |
| Junos | Juniper | 15.1-r6-s6 (including) | 15.1-r6-s6 (including) |
| Junos | Juniper | 15.1-r7 (including) | 15.1-r7 (including) |
| Junos | Juniper | 15.1-r7-s1 (including) | 15.1-r7-s1 (including) |
| Junos | Juniper | 15.1-r7-s10 (including) | 15.1-r7-s10 (including) |
| Junos | Juniper | 15.1-r7-s11 (including) | 15.1-r7-s11 (including) |
| Junos | Juniper | 15.1-r7-s2 (including) | 15.1-r7-s2 (including) |
| Junos | Juniper | 15.1-r7-s3 (including) | 15.1-r7-s3 (including) |
| Junos | Juniper | 15.1-r7-s4 (including) | 15.1-r7-s4 (including) |
| Junos | Juniper | 15.1-r7-s5 (including) | 15.1-r7-s5 (including) |
| Junos | Juniper | 15.1-r7-s6 (including) | 15.1-r7-s6 (including) |
| Junos | Juniper | 15.1-r7-s7 (including) | 15.1-r7-s7 (including) |
| Junos | Juniper | 15.1-r7-s8 (including) | 15.1-r7-s8 (including) |
| Junos | Juniper | 15.1-r7-s9 (including) | 15.1-r7-s9 (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-s3 (including) | 18.4-r1-s3 (including) |
| Junos | Juniper | 18.4-r1-s4 (including) | 18.4-r1-s4 (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-r1-s7 (including) | 18.4-r1-s7 (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-r2-s4 (including) | 18.4-r2-s4 (including) |
| Junos | Juniper | 18.4-r2-s5 (including) | 18.4-r2-s5 (including) |
| Junos | Juniper | 18.4-r2-s6 (including) | 18.4-r2-s6 (including) |
| Junos | Juniper | 18.4-r2-s7 (including) | 18.4-r2-s7 (including) |
| Junos | Juniper | 18.4-r2-s8 (including) | 18.4-r2-s8 (including) |
| Junos | Juniper | 18.4-r2-s9 (including) | 18.4-r2-s9 (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 | 18.4-r3-s10 (including) | 18.4-r3-s10 (including) |
| Junos | Juniper | 18.4-r3-s2 (including) | 18.4-r3-s2 (including) |
| Junos | Juniper | 18.4-r3-s3 (including) | 18.4-r3-s3 (including) |
| Junos | Juniper | 18.4-r3-s4 (including) | 18.4-r3-s4 (including) |
| Junos | Juniper | 18.4-r3-s5 (including) | 18.4-r3-s5 (including) |
| Junos | Juniper | 18.4-r3-s6 (including) | 18.4-r3-s6 (including) |
| Junos | Juniper | 18.4-r3-s7 (including) | 18.4-r3-s7 (including) |
| Junos | Juniper | 18.4-r3-s8 (including) | 18.4-r3-s8 (including) |
| Junos | Juniper | 18.4-r3-s9 (including) | 18.4-r3-s9 (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-r1-s5 (including) | 19.1-r1-s5 (including) |
| Junos | Juniper | 19.1-r1-s6 (including) | 19.1-r1-s6 (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-r2-s2 (including) | 19.1-r2-s2 (including) |
| Junos | Juniper | 19.1-r2-s3 (including) | 19.1-r2-s3 (including) |
| Junos | Juniper | 19.1-r3 (including) | 19.1-r3 (including) |
| Junos | Juniper | 19.1-r3-s1 (including) | 19.1-r3-s1 (including) |
| Junos | Juniper | 19.1-r3-s2 (including) | 19.1-r3-s2 (including) |
| Junos | Juniper | 19.1-r3-s3 (including) | 19.1-r3-s3 (including) |
| Junos | Juniper | 19.1-r3-s4 (including) | 19.1-r3-s4 (including) |
| Junos | Juniper | 19.1-r3-s5 (including) | 19.1-r3-s5 (including) |
| Junos | Juniper | 19.1-r3-s6 (including) | 19.1-r3-s6 (including) |
| Junos | Juniper | 19.1-r3-s7 (including) | 19.1-r3-s7 (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-r1-s5 (including) | 19.2-r1-s5 (including) |
| Junos | Juniper | 19.2-r1-s6 (including) | 19.2-r1-s6 (including) |
| Junos | Juniper | 19.2-r1-s7 (including) | 19.2-r1-s7 (including) |
| Junos | Juniper | 19.2-r1-s8 (including) | 19.2-r1-s8 (including) |
| Junos | Juniper | 19.2-r2 (including) | 19.2-r2 (including) |
| Junos | Juniper | 19.2-r2-s1 (including) | 19.2-r2-s1 (including) |
| Junos | Juniper | 19.2-r3 (including) | 19.2-r3 (including) |
| Junos | Juniper | 19.2-r3-s1 (including) | 19.2-r3-s1 (including) |
| Junos | Juniper | 19.2-r3-s2 (including) | 19.2-r3-s2 (including) |
| Junos | Juniper | 19.2-r3-s3 (including) | 19.2-r3-s3 (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 | 19.3-r2-s4 (including) | 19.3-r2-s4 (including) |
| Junos | Juniper | 19.3-r2-s5 (including) | 19.3-r2-s5 (including) |
| Junos | Juniper | 19.3-r2-s6 (including) | 19.3-r2-s6 (including) |
| Junos | Juniper | 19.3-r3 (including) | 19.3-r3 (including) |
| Junos | Juniper | 19.3-r3-s1 (including) | 19.3-r3-s1 (including) |
| Junos | Juniper | 19.3-r3-s2 (including) | 19.3-r3-s2 (including) |
| Junos | Juniper | 19.3-r3-s3 (including) | 19.3-r3-s3 (including) |
| Junos | Juniper | 19.3-r3-s4 (including) | 19.3-r3-s4 (including) |
| Junos | Juniper | 19.4 (including) | 19.4 (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 | 19.4-r1-s3 (including) | 19.4-r1-s3 (including) |
| Junos | Juniper | 19.4-r1-s4 (including) | 19.4-r1-s4 (including) |
| Junos | Juniper | 19.4-r2 (including) | 19.4-r2 (including) |
| Junos | Juniper | 19.4-r2-s1 (including) | 19.4-r2-s1 (including) |
| Junos | Juniper | 19.4-r2-s2 (including) | 19.4-r2-s2 (including) |
| Junos | Juniper | 19.4-r2-s3 (including) | 19.4-r2-s3 (including) |
| Junos | Juniper | 19.4-r2-s4 (including) | 19.4-r2-s4 (including) |
| Junos | Juniper | 19.4-r2-s5 (including) | 19.4-r2-s5 (including) |
| Junos | Juniper | 19.4-r3 (including) | 19.4-r3 (including) |
| Junos | Juniper | 19.4-r3-s1 (including) | 19.4-r3-s1 (including) |
| Junos | Juniper | 19.4-r3-s2 (including) | 19.4-r3-s2 (including) |
| Junos | Juniper | 19.4-r3-s3 (including) | 19.4-r3-s3 (including) |
| Junos | Juniper | 19.4-r3-s4 (including) | 19.4-r3-s4 (including) |
| Junos | Juniper | 19.4-r3-s5 (including) | 19.4-r3-s5 (including) |
| Junos | Juniper | 19.4-r3-s6 (including) | 19.4-r3-s6 (including) |
| Junos | Juniper | 20.1 (including) | 20.1 (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) |
| Junos | Juniper | 20.1-r1-s3 (including) | 20.1-r1-s3 (including) |
| Junos | Juniper | 20.1-r1-s4 (including) | 20.1-r1-s4 (including) |
| Junos | Juniper | 20.1-r2 (including) | 20.1-r2 (including) |
| Junos | Juniper | 20.1-r2-s1 (including) | 20.1-r2-s1 (including) |
| Junos | Juniper | 20.1-r2-s2 (including) | 20.1-r2-s2 (including) |
| Junos | Juniper | 20.1-r3 (including) | 20.1-r3 (including) |
| Junos | Juniper | 20.1-r3-s1 (including) | 20.1-r3-s1 (including) |
| Junos | Juniper | 20.1-r3-s2 (including) | 20.1-r3-s2 (including) |
| Junos | Juniper | 20.2 (including) | 20.2 (including) |
| Junos | Juniper | 20.2-r1 (including) | 20.2-r1 (including) |
| Junos | Juniper | 20.2-r1-s1 (including) | 20.2-r1-s1 (including) |
| Junos | Juniper | 20.2-r1-s2 (including) | 20.2-r1-s2 (including) |
| Junos | Juniper | 20.2-r1-s3 (including) | 20.2-r1-s3 (including) |
| Junos | Juniper | 20.2-r2 (including) | 20.2-r2 (including) |
| Junos | Juniper | 20.2-r2-s1 (including) | 20.2-r2-s1 (including) |
| Junos | Juniper | 20.2-r2-s2 (including) | 20.2-r2-s2 (including) |
| Junos | Juniper | 20.2-r2-s3 (including) | 20.2-r2-s3 (including) |
| Junos | Juniper | 20.2-r3 (including) | 20.2-r3 (including) |
| Junos | Juniper | 20.2-r3-s1 (including) | 20.2-r3-s1 (including) |
| Junos | Juniper | 20.2-r3-s2 (including) | 20.2-r3-s2 (including) |
| Junos | Juniper | 20.3 (including) | 20.3 (including) |
| Junos | Juniper | 20.3-r1 (including) | 20.3-r1 (including) |
| Junos | Juniper | 20.3-r1-s1 (including) | 20.3-r1-s1 (including) |
| Junos | Juniper | 20.3-r2 (including) | 20.3-r2 (including) |
| Junos | Juniper | 20.3-r2-s1 (including) | 20.3-r2-s1 (including) |
| Junos | Juniper | 20.3-r3 (including) | 20.3-r3 (including) |
| Junos | Juniper | 20.3-r3-s1 (including) | 20.3-r3-s1 (including) |
| Junos | Juniper | 20.4 (including) | 20.4 (including) |
| Junos | Juniper | 20.4-r1 (including) | 20.4-r1 (including) |
| Junos | Juniper | 20.4-r1-s1 (including) | 20.4-r1-s1 (including) |
| Junos | Juniper | 20.4-r2 (including) | 20.4-r2 (including) |
| Junos | Juniper | 20.4-r2-s1 (including) | 20.4-r2-s1 (including) |
| Junos | Juniper | 20.4-r2-s2 (including) | 20.4-r2-s2 (including) |
| Junos | Juniper | 20.4-r3 (including) | 20.4-r3 (including) |
| Junos | Juniper | 21.1 (including) | 21.1 (including) |
| Junos | Juniper | 21.1-r1 (including) | 21.1-r1 (including) |
| Junos | Juniper | 21.1-r1-s1 (including) | 21.1-r1-s1 (including) |
| Junos | Juniper | 21.1-r2 (including) | 21.1-r2 (including) |
| Junos | Juniper | 21.1-r2-s1 (including) | 21.1-r2-s1 (including) |
| Junos | Juniper | 21.1-r2-s2 (including) | 21.1-r2-s2 (including) |
| Junos | Juniper | 21.2-r1 (including) | 21.2-r1 (including) |
| Junos | Juniper | 21.2-r1-s1 (including) | 21.2-r1-s1 (including) |
| Junos | Juniper | 21.2-r1-s2 (including) | 21.2-r1-s2 (including) |
| Junos | Juniper | 21.2-r2 (including) | 21.2-r2 (including) |
| Junos | Juniper | 21.3-r1 (including) | 21.3-r1 (including) |
| Junos | Juniper | 21.3-r1-s1 (including) | 21.3-r1-s1 (including) |