Knowledge Search


2019-01 Security Bulletin: Junos OS: QFX and PTX Series: FPC process crashes after J-Flow processes a malformed packet (CVE-2019-0014)

  [JSA10914] Show Article Properties

Product Affected:
This issue affects Junos OS 17.2X75, 17.4, 18.1, 18.2. Affected platforms: QFX and PTX Series.

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.

This issue only occurs when J-Flow is configured and learning next-hop addresses feature that is used to generate the true outgoing interface (OIF) statistic is enabled:
[services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2019-0014.


The following software releases have been updated to resolve this specific issue: Junos OS 17.2X75-D91, 17.2X75-D100, 17.4R2-S1, 17.4R3, 18.1R3-S1, 18.2R1-S3, 18.2R2, 18.2X75-D5, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1348417 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).


Disable the functionality of learning of next-hop addresses:
# set services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning disable 

Software Releases, patches and updates are available at
Modification History:
  • 2019-01-09: Initial Publication.
Related Links:
CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."