CVE-2026-33781
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.
Affected products
7cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:24.4:r1-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:25.2:r2:*:*:*:*:*:*
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- kb.juniper.net/JSA107869nvdMitigationVendor Advisory
News mentions
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