Junos OS (SRX firewalls)
CVE-2024-47506: SRX Series: A large amount of traffic being processed by ATP Cloud can lead to a PFE crash
A Deadlock vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based 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 (SRX Series) 0 | 21.3R3-S1 or later |
| Junos OS (SRX Series) 21.4 | 21.4R3 or later |
| Junos OS (SRX Series) 22.1 | 22.1R2 or later |
| Junos OS (SRX Series) 22.2 | 22.2R1-S2, 22.2R2 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Deadlock vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).
When a large amount of traffic is processed by ATP Cloud inspection, a deadlock can occur which will result in a PFE crash and restart. Whether the crash occurs, depends on system internal timing that is outside the attackers control.
This issue affects Junos OS on SRX Series:
- All versions before 21.3R3-S1,
- 21.4 versions before 21.4R3,
- 22.1 versions before 22.1R2,
- 22.2 versions before 22.2R1-S2, 22.2R2.
Am I affected?
To be exposed to this issue a minimal configuration like the following needs to be present:
[ services advanced-anti-malware policy <aamw-policy-name> ... ] [ security policies from-zone <source-zone> to-zone <destination-zone> policy <name> then permit application-services advanced-anti-malware-policy <aamw-policy-name> ]
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.