EUVD-2026-21201
GHSA-q83c-r2qf-fvp6
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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:U/V:X/RE:M/U:X
Lifecycle Timeline
3Tags
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-EVO, 25.2R2-EVO.
Analysis
Complete persistent denial of service in Juniper Networks Junos OS Evolved on PTX Series routers allows authenticated, low-privilege network attackers to crash the evo-aftmand service with no automatic recovery. The vulnerability triggers when PCEP-provisioned colored SRTE policy tunnels with 32-bit ASN values (greater than 65,535) in the Originator ASN field are monitored via gRPC, causing permanent forwarding plane failure until manual system restart. …
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Remediation
Within 24 hours: Inventory all PTX Series routers running Junos OS Evolved through version 25.2 and identify which systems have PCEP-provisioned colored SRTE policies with 32-bit ASN values. Within 7 days: Implement access controls restricting network users with PCEP provisioning capability to trusted administrators only, and disable gRPC monitoring of affected SRTE policy tunnels if operationally feasible. …
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