Junos OS: QFX and PTX Series: FPC process crashes after J-Flow processes a malformed packet

published 2019-01-15 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-0821

cvss: 7.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

Juniper Networks Junos OS 17.2X75-D91, 17.2X75-D100, 17.4R2-S1, 17.4R3, 18.1R3-S1, 18.1R4, 18.2R1-S3, 18.2R2

kb.juniper.net/JSA10914 advisory

Exploit prediction

1.71% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

Juniper Networks Junos OS

Classification

Weakness

CWE-19 Data Processing Errors

References

kb.juniper.net /JSA10914
mitigation, patch, vendor-advisory
securityfocus.com /bid/106556
vdb-entry, third-party-advisory

Sources

CVE List CVE-2019-0014
NVD CVE-2019-0014

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary