CVE-2026-33781

HIGH EPSS 6.1%
Published Apr 9, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 4.0
High
Find Similar
Published Apr 9, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX and QFX Series devices allow an unauthenticated, adjacent attacker to cause a complete Denial of Service (DoS). On EX4k, and QFX5k platforms configured as service-provider edge devices, if L2PT is enabled on the UNI and VSTP is enabled on NNI in VXLAN scenarios, receiving VSTP BPDUs on UNI leads to packet buffer allocation failures, resulting in the device to not pass traffic anymore until it is manually recovered with a restart.This issue affects Junos OS: * 24.4 releases before 24.4R2, * 25.2 releases before 25.2R1-S1, 25.2R2. This issue does not affect Junos OS releases before 24.4R1.

CVSS Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:X/V:X/RE:M/U:X
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
6.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-754

Affected Products 25

VendorProductVersionRange
juniperjunos24.4any
juniperjunos24.4any
juniperjunos24.4any
juniperjunos24.4any
juniperjunos25.2any
juniperjunos25.2any
juniperjunos25.2any
juniperex4000*any
juniperex4100*any
juniperex4100-f*any
juniperex4100-h*any
juniperex4300*any
juniperex4400*any
juniperex4600*any
juniperex4650*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/JSA107869
    MitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.