Due to a vulnerability in DDoS protection in Juniper Networks Junos OS and Junos OS Evolved on QFX5K Series switches in a VXLAN configuration, instability might be experienced in the underlay network as a consequence of exceeding the default ddos-protection aggregate threshold. If an attacker on a client device on the overlay network sends a high volume of specific, legitimate traffic in the overlay network, due to an improperly detected DDoS violation, the leaf might not process certain L2 traffic, sent by spines in the underlay network. Continued receipt and processing of the high volume traffic will sustain the Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on QFX5K Series: 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R3-S5; 18.1 versio
The following software releases have been updated to resolve this specific issue: Junos OS: 17.3R3-S11, 17.4R3-S5, 18.1R3-S13, 18.2R2-S8, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases. Junos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.
There are no available workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.3<17.3R3-S11 | 17.3R3-S11 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R3-S5 | 17.4R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S13 | 18.1R3-S13 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R2-S8, 18.2R3-S8 | 18.2R2-S8, 18.2R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S5 | 18.3R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R1-S8, 18.4R2-S6, 18.4R3-S6 | 18.4R1-S8, 18.4R2-S6, 18.4R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R3-S4 | 19.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R1-S6, 19.2R3-S2 | 19.2R1-S6, 19.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S2 | 19.3R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R2-S4, 19.4R3-S1 | 19.4R2-S4, 19.4R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2 | 20.1R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R2 | 20.2R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R1-S2, 20.3R2 | 20.3R1-S2, 20.3R2 | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=unspecified<20.3R2-EVO | 20.3R2-EVO | advisory ↗ |