CVE-2019-0009 Junos OS: EX2300 and EX3400: High disk I/O operations may disrupt the communication between RE and PFE

What is CVE-2019-0009?

CVE-2019-0009 is a medium-severity denial of service vulnerability in Juniper Junos, published on 15 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

On EX2300 and EX3400 series, high disk I/O operations may disrupt the communication between the routing engine (RE) and the packet forwarding engine (PFE). In a virtual chassis (VC) deployment, this issue disrupts communication between the VC members. This issue does not affect other Junos platforms. Affected releases are Junos OS on EX2300 and EX3400 series: 15.1X53 versions prior to 15.1X53-D590; 18.1 versions prior to 18.1R2-S2, 18.1R3; 18.2 versions prior to 18.2R2.

Which versions are affected by CVE-2019-0009?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2019-0009?

No fix has been published for CVE-2019-0009 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-0009 being exploited?

There is no known exploitation of CVE-2019-0009 in the wild and no public exploit code.

Other vulnerabilities in Juniper Junos

• CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Exploited Critical 9.8
• CVE-2020-1631 Juniper Junos OS Path Traversal Exploited High 8.8
• CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization Exploited Medium 6.7
• CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function Exploited Medium 5.3
• CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification Exploited Medium 5.3

All Juniper Junos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-29c6-mr8r-mfmj.