CVE-2019-0014: Juniper Junos

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

On QFX and PTX Series, receipt of a malformed packet for J-Flow sampling might crash the FPC (Flexible PIC Concentrator) process which causes all interfaces to go down. By continuously sending the offending packet, an attacker can repeatedly crash the FPC process causing a sustained Denial of Service (DoS). This issue affects both IPv4 and IPv6 packet processing. Affected releases are Juniper Networks Junos OS on QFX and PTX Series: 17.4 versions prior to 17.4R2-S1, 17.4R3; 18.1 versions prior to 18.1R3-S1; 18.2 versions prior to 18.2R1-S3, 18.2R2; 17.2X75 versions prior to 17.2X75-D91, 17.2X75-D100.

Affected products

• Juniper Junos: version 17.2x75 only; version 17.4 only; version 18.2 only

Published 2019-01-15. Last modified 2026-06-17.