CVE-2020-1634: Juniper Junos

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

On High-End SRX Series devices, in specific configurations and when specific networking events or operator actions occur, an SPC receiving genuine multicast traffic may core. Subsequently, all FPCs in a chassis may reset causing a Denial of Service. This issue affects both IPv4 and IPv6. This issue affects: Juniper Networks Junos OS 12.3X48 version 12.3X48-D80 and later versions prior to 12.3X48-D95 on High-End SRX Series. This issue does not affect Branch SRX Series devices.

Affected products

• Juniper Junos: version 12.3x48 only

Published 2020-04-08. Last modified 2026-06-17.