Is CVE-2026-33781 actively exploited?

No active exploitation of CVE-2026-33781 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33781 be exploited remotely?

Partially. CVE-2026-33781 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-33781?

CVE-2026-33781 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-33781

CWE-754Published: April 9, 2026· Updated: Apr 13, 2026

6.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:3.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33781 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.