# CVE-2026-33773: An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos…

Source: https://junglewise.ai/threats/cve-2026-33773-an-incorrect-initialization-of-resource-vulnerability-in-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-09  
License: CC BY 4.0 with a link back

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 other Junos OS versions are affected.

Technologies: [Juniper Junos](https://junglewise.ai/threats/technologies/junos). Vendors: [Juniper](https://junglewise.ai/threats/vendors/juniper).

## Quick answers

**Is CVE-2026-33773 exploited in the wild?** 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.

## Affected products

- Juniper Ex2300
- Juniper Ex2300-C
- Juniper Ex3400
- Juniper Ex4000
- Juniper Ex4100
- Juniper Ex4100-F
- Juniper Ex4100-H
- Juniper Ex4300
- Juniper Ex4400
- Juniper Ex4600
- Juniper Ex4650
- Juniper Ex9204
- Juniper Ex9208
- Juniper Ex9214
- Juniper Junos
- Juniper Qfx10008
- Juniper Qfx10016
- Juniper Qfx5110
- Juniper Qfx5120
- Juniper Qfx5130
- Juniper Qfx5200
- Juniper Qfx5210
- Juniper Qfx5220
- Juniper Qfx5230-64cd
- Juniper Qfx5240
- Juniper Qfx5241
- Juniper Qfx5700

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