CVE-2024-39533 Junos OS: QFX5000 Series and EX4600 Series: Output firewall filter is not applied if certain match criteria are used
An attacker can bypass firewall filters on Juniper switches if unsupported match criteria are used, allowing unauthorized traffic to pass through.
- 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-2024-39533?
CVE-2024-39533 is a medium-severity vulnerability in Juniper Junos, published on 11 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-447
Which versions are affected by CVE-2024-39533?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2024-39533?
No fix has been published for CVE-2024-39533 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-39533 being exploited?
There is no known exploitation of CVE-2024-39533 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-5qpv-687p-m54h.