CVE-2026-33803: Juniper Junos OS Evolved

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets. This issue affects Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S4-EVO, * 25.2 versions before 25.2R2-S1-EVO, * 25.4 versions before 25.4R1-S2-EVO.

Affected products

• Juniper Junos OS Evolved: before 23.2 (fixed in 23.2); version 23.2 only; version 23.4 only; version 24.2 only; version 24.4 only; version 25.2 only; …

Published 2026-07-09. Last modified 2026-07-13.