Junos OS and Junos OS Evolved: QFX5K Series: Underlay network traffic might not be processed upon receipt of high rate of specific genuine overlay packets in VXLAN scenario

Summary

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 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R2-S8, 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S2, 20.3R2. Juniper Networks Junos OS Evolved on QFX5220: All versions prior to 20.3R2-EVO.

Timeline

1. Apr 22, 2021, 7:37 PM UTCCVE published
2. Sep 16, 2024, 5:48 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  From 17.3 · fixed in 17.3R3-S11; From 17.4 · fixed in 17.4R3-S5; From 18.1 · fixed in 18.1R3-S13; From 18.3 · fixed in 18.3R3-S5; From 19.1 · fixed in 19.1R3-S4; From 19.3 · fixed in 19.3R3-S2; From 20.1 · fixed in 20.1R2; From 20.2 · fixed in 20.2R2

• Juniper Networks Junos OS Evolved

  fixed in 20.3R2-EVO

References 1