CVE-2026-102050 Juniper Networks CVE debrief

Who should care

Administrators of Junos OS and Junos OS Evolved systems, particularly those with LLDP enabled on interfaces, should review and apply security patches, verify LLDP configuration, and monitor network stability. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for ensuring the security and stability of their networks.

Why it matters

CVE-2026-102050 is a high-severity vulnerability in Junos OS and Junos OS Evolved that can cause a denial of service in Layer 2 control-plane processing. Administrators should review and apply security patches, verify LLDP configuration, and monitor network stability.

• Denial of service in Layer 2 control-plane processing
• Disruption of LLDP and other Layer 2 control protocols
• Potential impact on network stability and availability
• Need for verification of affected versions and remediation status

Technical summary

A Stack-based Buffer Overflow vulnerability in the l2cpd daemon of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a denial of service in Layer 2 control-plane processing via LLDP packets received on an interface configured for LLDP. The vulnerability impacts Layer 2 control-plane processing, potentially disrupting LLDP and other Layer 2 control protocols, and affecting network stability and availability. Administrators should review and apply security patches, verify LLDP configuration, and monitor network stability.

Defensive priority

High priority for Junos OS and Junos OS Evolved administrators

Recommended defensive actions

• Review and apply Juniper Networks security patches for affected Junos OS and Junos OS Evolved versions
• Verify LLDP is not enabled on untrusted interfaces
• Monitor Layer 2 control-plane processing for anomalies
• Restrict access to LLDP configuration to authorized personnel
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and source item provide details on a Stack-based Buffer Overflow vulnerability in Junos OS and Junos OS Evolved, allowing an adjacent attacker to cause a denial of service in Layer 2 control-plane processing via LLDP packets.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.