CVE-2026-33783

/// Technical description

A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS Evolved on PTX Series allows a network-based, authenticated attacker with low privileges to cause a complete Denial of Service (DoS).

If colored SRTE policy tunnels are provisioned via PCEP, and gRPC is used to monitor traffic in these tunnels, evo-aftmand crashes and doesn't restart which leads to a complete and persistent service impact. The system has to be manually restarted to recover. The issue is seen only when the Originator ASN field in PCEP contains a value larger than 65,535 (32-bit ASN). The issue is not reproducible when SRTE policy tunnels are statically configured.

This issue affects Junos OS Evolved on PTX Series: 

* all versions before 22.4R3-S9-EVO,

* 23.2 versions before 23.2R2-S6-EVO,

* 23.4 versions before 23.4R2-S7-EVO,

* 24.2 versions before 24.2R2-S4-EVO,

* 24.4 versions before 24.4R2-S2-EVO,

* 25.2 versions before 25.2R1-S2-EV

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References