CVE-2024-30403 Junos OS Evolved: When MAC learning happens, and an interface gets flapped, the PFE crashes
An unauthenticated adjacent attacker can cause a sustained Denial of Service by triggering a NULL pointer dereference in the Packet Forwarding Engine during interface flapping.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-30403?
CVE-2024-30403 is a high-severity vulnerability in Juniper Junos Os Evolved, published on 12 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A NULL Pointer Dereference vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).
When Layer 2 traffic is sent through a logical interface, MAC learning happens. If during this process, the interface flaps, an Advanced Forwarding Toolkit manager (evo-aftmand-bt) core is observed. This leads to a PFE restart. The crash reoccurs if the same sequence of events happens, which will lead to a sustained DoS condition.
This issue affects Juniper Networks Junos OS Evolved 23.2-EVO versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.
Weakness: CWE-476
Which versions are affected by CVE-2024-30403?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2024-30403?
No fix has been published for CVE-2024-30403 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-30403 being exploited?
There is no known exploitation of CVE-2024-30403 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos Os Evolved
- CVE-2026-21902 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
- CVE-2023-28983 Junos OS Evolved: Shell Injection vulnerability in the gNOI server
- CVE-2025-21599 Denial of service in Junos OS Evolved
- CVE-2024-47502 Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS
- CVE-2024-39531 Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
Sources
Also known as GHSA-hxmw-j74g-j23w.