1. Home
  2. CVE Database
  3. CVE-2026-33773
MEDIUM · 5.8

CVE-2026-33773

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-...

Vulnerability Description

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.

CVSS Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
JuniperJunos23.4
JuniperEx2300-
JuniperEx2300-C-
JuniperEx3400-
JuniperEx4000-
JuniperEx4100-
JuniperEx4100-F-
JuniperEx4100-H-
JuniperEx4300-
JuniperEx4400-
JuniperEx4600-
JuniperEx4650-
JuniperEx9204-
JuniperEx9208-
JuniperEx9214-
JuniperQfx10008-
JuniperQfx10016-
JuniperQfx5110-
JuniperQfx5120-
JuniperQfx5130-

References

FAQ

What is CVE-2026-33773?

CVE-2026-33773 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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-...

How severe is CVE-2026-33773?

CVE-2026-33773 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33773?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Juniper Ex2300, Juniper Ex2300-C, Juniper Ex3400, Juniper Ex4000.