Dashboard / CVE-2026-33781

CVE-2026-33781

HIGH
MEDIUM Priority: 0.01 BB Relevance: 59/100
Published: 2026-04-09 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Adjacent Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Adjacent
AC: Low
PR: None
UI: None
S: X
AT: None
VC: None
VI: None
VA: High

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.

Weakness Classification (1)

Affected Software (7)

VendorProductVersion
juniper junos 24.4
juniper junos 24.4
juniper junos 24.4
juniper junos 24.4
juniper junos 25.2
juniper junos 25.2
juniper junos 25.2

References & Advisories (1)

https://kb.juniper.net/JSA107869
Mitigation Vendor Advisory

Bug Bounty Relevance

59 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.1 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.17%
Raw Score 0.001650
Percentile 5.7%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00165
2026-10-28
0.00165

Intelligence Sources

nvd ref →

External Links