CVE-2024-30389 Junos OS: EX4300 Series: Firewall filter not blocking egress traffic
An unauthenticated attacker can bypass output firewall filters on Juniper EX4300 switches, allowing unauthorized egress traffic to reach downstream networks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-30389?
CVE-2024-30389 is a medium-severity vulnerability in Juniper Junos, published on 12 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Incorrect Behavior Order vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on EX4300 Series allows an unauthenticated, network-based attacker to cause an integrity impact to networks downstream of the vulnerable device.
When an output firewall filter is applied to an interface it doesn't recognize matching packets but permits any traffic. This issue affects Junos OS 21.4 releases from 21.4R1 earlier than 21.4R3-S6. This issue does not affect Junos OS releases earlier than 21.4R1.
Weakness: CWE-696
Which versions are affected by CVE-2024-30389?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2024-30389?
No fix has been published for CVE-2024-30389 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-30389 being exploited?
There is no known exploitation of CVE-2024-30389 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
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-x368-w88j-3c3r.