CVE-2026-33773

MEDIUM EPSS 10.0%
Published Apr 9, 20262mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Apr 9, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
10.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Affected Products 28

VendorProductVersionRange
juniperjunos23.4any
juniperjunos24.2any
juniperex2300*any
juniperex2300-c*any
juniperex3400*any
juniperex4000*any
juniperex4100*any
juniperex4100-f*any
juniperex4100-h*any
juniperex4300*any
juniperex4400*any
juniperex4600*any
juniperex4650*any
juniperex9204*any
juniperex9208*any
juniperex9214*any
juniperqfx10008*any
juniperqfx10016*any
juniperqfx5110*any
juniperqfx5120*any
juniperqfx5130*any
juniperqfx5200*any
juniperqfx5210*any
juniperqfx5220*any
juniperqfx5230-64cd*any
juniperqfx5240*any
juniperqfx5241*any
juniperqfx5700*any

References 1

  • kb.juniper.net https://kb.juniper.net/JSA107815
    MitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.