CVE-2026-57032: CWE-236 Improper Handling of Undefined Parameters in Juniper Networks Junos OS
An Improper Handling of Undefined Parameters vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on EX Series devices allows an authenticated attacker with low privileges to cause a Denial-of-Service (DoS). If an attempt is made to subscribe to an unsupported telemetry sensor path on EX2300, EX3400, EX4000, EX4100 and EX4400 via gRPC, this causes the FPC to crash. This leads to a complete service outage until the module has automatically restarted. The following log message can be seen when this issue happens: agentd[<PID>]: AGENTD_RESOURCE_NOT_FOUND: No resource name found for <sensor> This issue affects Junos OS on EX2300, EX3400, EX4000, EX4100 and EX4400 devices: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2.
AI Analysis
Technical Summary
This vulnerability arises from improper handling of undefined parameters (CWE-236) in the packet forwarding engine of Juniper Junos OS on EX Series devices. When an authenticated user with low privileges attempts to subscribe to an unsupported telemetry sensor path on EX2300, EX3400, EX4000, EX4100, or EX4400 devices via gRPC, the forwarding processing card crashes. The crash leads to a complete service outage until the module automatically restarts. The issue is logged with messages indicating missing resource names for the requested sensor. Affected versions include all versions before 23.2R2-S7, 23.4 versions before 23.4R2-S8, 24.2 versions before 24.2R2-S5, and 24.4 versions before 24.4R2.
Potential Impact
An authenticated attacker with low privileges can cause a denial-of-service by triggering a crash in the forwarding processing card through subscribing to unsupported telemetry sensor paths. This results in a complete service outage until the affected module automatically restarts. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to authenticated users who can subscribe to telemetry sensor paths and monitor for attempts to subscribe to unsupported sensors to reduce risk.
CVE-2026-57032: CWE-236 Improper Handling of Undefined Parameters in Juniper Networks Junos OS
Description
An Improper Handling of Undefined Parameters vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on EX Series devices allows an authenticated attacker with low privileges to cause a Denial-of-Service (DoS). If an attempt is made to subscribe to an unsupported telemetry sensor path on EX2300, EX3400, EX4000, EX4100 and EX4400 via gRPC, this causes the FPC to crash. This leads to a complete service outage until the module has automatically restarted. The following log message can be seen when this issue happens: agentd[<PID>]: AGENTD_RESOURCE_NOT_FOUND: No resource name found for <sensor> This issue affects Junos OS on EX2300, EX3400, EX4000, EX4100 and EX4400 devices: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper handling of undefined parameters (CWE-236) in the packet forwarding engine of Juniper Junos OS on EX Series devices. When an authenticated user with low privileges attempts to subscribe to an unsupported telemetry sensor path on EX2300, EX3400, EX4000, EX4100, or EX4400 devices via gRPC, the forwarding processing card crashes. The crash leads to a complete service outage until the module automatically restarts. The issue is logged with messages indicating missing resource names for the requested sensor. Affected versions include all versions before 23.2R2-S7, 23.4 versions before 23.4R2-S8, 24.2 versions before 24.2R2-S5, and 24.4 versions before 24.4R2.
Potential Impact
An authenticated attacker with low privileges can cause a denial-of-service by triggering a crash in the forwarding processing card through subscribing to unsupported telemetry sensor paths. This results in a complete service outage until the affected module automatically restarts. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to authenticated users who can subscribe to telemetry sensor paths and monitor for attempts to subscribe to unsupported sensors to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-06-23T16:27:00.249Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a50171868715ace431ea22f
Added to database: 07/09/2026, 21:48:08 UTC
Last enriched: 07/17/2026, 09:55:32 UTC
Last updated: 08/23/2026, 06:13:59 UTC
Views: 93
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