CVE-2026-33773: An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos…
CVE-2026-33773 · Severity: medium · CVSS 5.8 · Published 2026-04-09
An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks.
When the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked.
This issue affects Junos OS on EX Series and QFX Series:
* 23.4 version 23.4R2-S6,
* 24.2 version 24.2R2-S3.
No. Junglewise Threat Intelligence has no report of CVE-2026-33773 being exploited in the wild.
How severe is CVE-2026-33773?
Medium severity, with a CVSS score of 5.8, published 9 April 2026.
Which products and versions are affected?
Juniper Ex2300, Juniper Ex2300-C, Juniper Ex3400, Juniper Ex4000 and 23 more. The advisory does not name versions.
Is there a fix for CVE-2026-33773?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33773?
Check whether you run Juniper Ex2300, Juniper Ex2300-C, Juniper Ex3400 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.