Junos OS (SRX firewalls)
CVE-2024-39533: QFX5000 Series and EX4600 Series: Output firewall filter is not applied if certain match criteria are used
An Unimplemented or Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an unauthenticated, network-based attacker to cause a minor integrity impact to downstream networks.If one or more of the following match conditions ip-source-address ip-destination-address arp-type which are not supported for this type of filter, are used in an ethernet switching filter, and then this filter is applied as an output filter, the configuration can be committed but the filter will not be in effect.
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 (QFX5000 Series, EX4600 Series) 0 | 21.2R3-S7 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 21.4 | 21.4R3-S6 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 22.1 | 22.1R3-S5 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 22.2 | 22.2R3-S3 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 22.3 | 22.3R3-S2 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 22.4 | 22.4R3 or later |
| Junos OS (QFX5000 Series, EX4600 Series) 23.2 | 23.2R2 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Unimplemented or Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an unauthenticated, network-based attacker to cause a minor integrity impact to downstream networks.If one or more of the following match conditions
ip-source-address ip-destination-address arp-type
which are not supported for this type of filter, are used in an ethernet switching filter, and then this filter is applied as an output filter, the configuration can be committed but the filter will not be in effect.
This issue affects Junos OS on QFX5000 Series and EX4600 Series:
- All version before 21.2R3-S7,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
Please note that the implemented fix ensures these unsupported match conditions cannot be committed anymore.
Am I affected?
The following shows an example of such an affected filter: [ firewall family ethernet-switching filter <filter> term <term> from
ip-source-address
... ] [ interfaces <interface> unit <unit> family ethernet-switching filter output <filter> ]
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.