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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
3 versions affected across 19 products
CVE-2026-33781 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… https://www.cve.org/CVERecord?id=CVE-2026-33781
Post summary
The text announces CVE‑2026‑33781, describing an improper check vulnerability in Juniper’s packet forwarding engine on EX and QFX series, and links to the official CVE record.
25 of 25 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| HW | juniper | ex4000 | - | - | - |
| HW | juniper | ex4100 | - | - | - |
| HW | juniper | ex4100-f | - | - | - |
| HW | juniper | ex4100-h | - | - | - |
| HW | juniper | ex4300 | - | - | - |
| HW | juniper | ex4400 | - | - | - |
| HW | juniper | ex4600 | - | - | - |
| HW | juniper | ex4650 | - | - | - |
| OS | juniper | junos | 24.4 | - | - |
| OS | juniper | junos | 24.4 | - | - |
| OS | juniper | junos | 24.4 | - | - |
| OS | juniper | junos | 24.4 | - | - |
| OS | juniper | junos | 25.2 | - | - |
| OS | juniper | junos | 25.2 | - | - |
| OS | juniper | junos | 25.2 | - | - |
| HW | juniper | qfx5110 | - | - | - |
| HW | juniper | qfx5120 | - | - | - |
| HW | juniper | qfx5130 | - | - | - |
| HW | juniper | qfx5200 | - | - | - |
| HW | juniper | qfx5210 | - | - | - |
| HW | juniper | qfx5220 | - | - | - |
| HW | juniper | qfx5230-64cd | - | - | - |
| HW | juniper | qfx5240 | - | - | - |
| HW | juniper | qfx5241 | - | - | - |
| HW | juniper | qfx5700 | - | - | - |