A vulnerability in Juniper Networks Junos OS Evolved may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a pfemand process crash. The pfemand process is responsible for packet forwarding on the device. By continuously sending the packet flood, an attacker can repeatedly crash the pfemand process causing a sustained Denial of Service.
 

This issue can only be triggered by traffic sent to the device. Transit traffic does not cause this issue.
 

This issue affects all version of Junos OS Evolved prior to 19.1R1-EVO.
 

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

This issue was found during internal product security testing or research.
 

This issue has been assigned  CVE-2020-1626 .
 

The following software releases have been updated to resolve this specific issue: 19.1R1-EVO, 19.2R1-EVO, 19.3R1-EVO, and all subsequent releases.

This issue is being tracked as  1419130 .
 

Use access lists or firewall filters to limit access to the device to known TCP and UDP ports, and only from trusted, administrative networks or hosts.

​2020-04-08: Initial publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2020-1626: Junos OS Evolved: Denial of Service vulnerability in processing high rate of specific packets