Junos OS: EX Series, QFX Series: If the same egress filter is configured on both an IRB and a physical interface one of those is not applied
Summary
| CVE | CVE-2026-33773 |
|---|---|
| State | PUBLISHED |
| Assigner | juniper |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-09 22:16:25 UTC |
| Updated | 2026-04-17 17:56:54 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 6.9 MEDIUM from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
EPSS: 0.000470000 probability, percentile 0.141410000 (date 2026-04-20)
Problem Types: NVD-CWE-Other | CWE-1419 CWE-1419 Incorrect Initialization of Resource
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 6.9 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 6.9 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/... |
| 3.1 | [email protected] | Primary | 5.8 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
| 3.1 | CNA | CVSS | 5.8 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Hardware | Juniper | Ex2300 | - | All | All | All |
| Hardware | Juniper | Ex2300-c | - | All | All | All |
| Hardware | Juniper | Ex3400 | - | All | All | All |
| Hardware | Juniper | Ex4000 | - | All | All | All |
| Hardware | Juniper | Ex4100 | - | All | All | All |
| Hardware | Juniper | Ex4100-f | - | All | All | All |
| Hardware | Juniper | Ex4100-h | - | All | All | All |
| Hardware | Juniper | Ex4300 | - | All | All | All |
| Hardware | Juniper | Ex4400 | - | All | All | All |
| Hardware | Juniper | Ex4600 | - | All | All | All |
| Hardware | Juniper | Ex4650 | - | All | All | All |
| Hardware | Juniper | Ex9204 | - | All | All | All |
| Hardware | Juniper | Ex9208 | - | All | All | All |
| Hardware | Juniper | Ex9214 | - | All | All | All |
| Operating System | Juniper | Junos | 23.4 | r2-s6 | All | All |
| Operating System | Juniper | Junos | 24.2 | r2-s3 | All | All |
| Hardware | Juniper | Qfx10008 | - | All | All | All |
| Hardware | Juniper | Qfx10016 | - | All | All | All |
| Hardware | Juniper | Qfx5110 | - | All | All | All |
| Hardware | Juniper | Qfx5120 | - | All | All | All |
| Hardware | Juniper | Qfx5130 | - | All | All | All |
| Hardware | Juniper | Qfx5200 | - | All | All | All |
| Hardware | Juniper | Qfx5210 | - | All | All | All |
| Hardware | Juniper | Qfx5220 | - | All | All | All |
| Hardware | Juniper | Qfx5230-64cd | - | All | All | All |
| Hardware | Juniper | Qfx5240 | - | All | All | All |
| Hardware | Juniper | Qfx5241 | - | All | All | All |
| Hardware | Juniper | Qfx5700 | - | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Juniper Networks | Junos OS | affected 23.4R2-S6 23.4R2-S7 semver | EX Series, QFX Series |
| CNA | Juniper Networks | Junos OS | affected 24.2R2-S3 24.2R2-S4 semver | EX Series, QFX Series |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| kb.juniper.net/JSA107815 | [email protected] | kb.juniper.net | Mitigation, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: The following software releases have been updated to resolve this specific issue: 23.4R2-S7, 24.2R2-S4.
Workarounds
CNA: Two different workarounds are available: 1. create the same filter but under a different name and apply that to one of the interfaces, so that each interface has a unique copy of the filter in question as shown in the following example: user@host# copy ... <filter> to ... <filter2> user@host# set interfaces irb unit <unit2> family inet/inet6 filter output <filter2> 2. configure the filter as "interface specific" by adding the keyword to the filter definition: [ firewall family inet/inet6 filter <filter> interface-specific ] which implicitly creates a copy of the original filter per applied interface.
Exploits
CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.