CVE-2026-102049 Juniper Networks CVE debrief

Who should care

Network administrators, security teams, and incident response teams should assess exposure and potential impact, and prioritize verification and mitigation efforts. IT managers and network operators should also be aware of the vulnerability and its potential implications for network security and operations. Vulnerability management teams should review and update their vulnerability management plans to address this vulnerability.

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact, as the vulnerability allows for denial of service or arbitrary code execution via LLDP traffic on interfaces with Unified Access Policy enabled.

• Denial of service via LLDP traffic
• Potential arbitrary code execution with root privileges
• Verification of exposure and impact required
• Prioritization of incident response planning

Technical summary

The vulnerability exists in the l2cpd process of Juniper Networks Junos OS and Junos OS Evolved, allowing an adjacent unauthenticated attacker to cause a denial of service or execute arbitrary code with root privileges via LLDP traffic received on an interface with Unified Access Policy enabled. The vulnerability is caused by improper handling of LLDP traffic, which can lead to a stack-based buffer overflow. This could allow attackers to gain control of affected systems or disrupt network operations. Affected product deployments should be identified and prioritized for verification and mitigation efforts.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, as the vulnerability allows for denial of service or arbitrary code execution.

Recommended defensive actions

• Verify exposure by checking if Unified Access Policy is enabled on interfaces
• Assess potential impact on network infrastructure
• Monitor for LLDP traffic anomalies
• Review and update incident response plans
• Apply vendor patches or updates as available
• Implement compensating controls for exposed systems
• Conduct regular security audits and vulnerability assessments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but vendor-provided information is limited. The vulnerability affects Juniper Networks Junos OS and Junos OS Evolved. Defenders should verify exposure and assess potential impact based on available information. Limited source detail suggests exercising caution and verifying information through multiple sources.

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.