CVE-2026-102047 Juniper Networks CVE debrief

Who should care

Defenders responsible for Juniper Networks Junos OS and Junos OS Evolved systems, particularly those using MVRP-enabled interfaces, should assess exposure and prioritize verification and patching of affected versions.

Why it matters

Defenders should prioritize verifying and updating affected Junos OS and Junos OS Evolved versions to prevent potential denial of service attacks. This vulnerability requires verification from official sources to determine affected versions and remediation steps.

• Potential denial of service in associated Layer 2 control protocols
• Need to verify and update affected Junos OS and Junos OS Evolved versions
• Possible disruption of network operations if exploited

Technical summary

An Improper Validation of Consistency within Input vulnerability in the l2cpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated Layer 2 attacker to cause a denial of service in associated Layer 2 control protocols via a crafted MVRP Ethernet frame sent to an MVRP-enabled interface. The vulnerability affects the l2cpd process and requires verification from official sources to determine affected versions and remediation steps. The vulnerability involves an Improper Validation of Consistency within Input vulnerability, allowing an adjacent unauthenticated Layer 2 attacker to cause a denial of service. Defenders should prioritize verifying and updating affected Junos OS

Defensive priority

Defenders should prioritize verifying and updating affected Junos OS and Junos OS Evolved versions to prevent potential denial of service attacks.

Recommended defensive actions

• Verify and update affected Junos OS and Junos OS Evolved versions
• Review and implement vendor-provided patches
• Monitor network traffic for suspicious MVRP Ethernet frames
• 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to vendor advisories. The vulnerability is caused by an Improper Validation of Consistency within Input vulnerability in the l2cpd process of Juniper Networks Junos OS and Junos OS Evolved. The CVE Program record and NIST NVD detail page provide official information on the vulnerability. The source item provides additional details on the vulnerability. Vendor advisories provide information on affected and 3

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.