Junos OS (SRX firewalls)
CVE-2024-30387: ACX5448 & ACX710: Due to interface flaps the PFE process can crash
A Missing Synchronization vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on ACX5448 and ACX710 allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (ACX5448, ACX710) 0 | 20.4R3-S9 or later |
| Junos OS (ACX5448, ACX710) 21.2 | 21.2R3-S5 or later |
| Junos OS (ACX5448, ACX710) 21.3 | 21.3R3-S5 or later |
| Junos OS (ACX5448, ACX710) 21.4 | 21.4R3-S4 or later |
| Junos OS (ACX5448, ACX710) 22.1 | 22.1R3-S2 or later |
| Junos OS (ACX5448, ACX710) 22.2 | 22.2R3-S2 or later |
| Junos OS (ACX5448, ACX710) 22.3 | 22.3R2-S2, 22.3R3 or later |
| Junos OS (ACX5448, ACX710) 22.4 | 22.4R2, 22.4R3 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Missing Synchronization vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on ACX5448 and ACX710 allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).
If an interface flaps while the system gathers statistics on that interface, two processes simultaneously access a shared resource which leads to a PFE crash and restart.
This issue affects Junos OS:
- All versions before 20.4R3-S9,
- 21.2 versions before 21.2R3-S5,
- 21.3 versions before 21.3R3-S5,
- 21.4 versions before 21.4R3-S4,
- 22.1 versions before 22.1R3-S2,
- 22.2 versions before 22.2R3-S2,
- 22.3 versions before 22.3R2-S2, 22.3R3,
- 22.4 versions before 22.4R2.
Workarounds
There are no known workarounds for this issue.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.