CVE-2026-102030 Juniper Networks CVE debrief

Who should care

Network administrators and security teams responsible for managing Junos OS and Junos OS Evolved configurations, especially those using BGP MVPN inter-region tunneling, should assess potential exposure and impact.

Why it matters

CVE-2026-102030 is a denial of service vulnerability in Junos OS and Junos OS Evolved that can be exploited via BGP MVPN updates when inter-region segmented VRF is configured. Network administrators and security teams should verify exposure, assess impact, and prioritize remediation.

• Potential denial of service to routing daemon
• Need to verify configurations and assess potential impact
• Possible disruption to network operations
• Requires review and update of Junos OS and Junos OS Evolved versions

Technical summary

The rpd process in Junos OS and Junos OS Evolved is vulnerable to a denial of service attack when BGP MVPN inter-region tunneling is used. A configured MVPN neighbor can cause a denial of service via a BGP MVPN update when an inter-region segmented VRF with 'protocols mvpn inter-region-template' is configured. This vulnerability can be exploited by an attacker, causing a denial of service to the routing daemon. Network administrators and security teams should verify exposure and assess potential impact, focusing on configurations using BGP MVPN inter-region tunneling.

Defensive priority

Network administrators and security teams should prioritize verifying exposure and assessing potential impact, focusing on configurations using BGP MVPN inter-region tunneling.

Recommended defensive actions

• Verify configurations using BGP MVPN inter-region tunneling and assess potential impact
• Review and update Junos OS and Junos OS Evolved versions to ensure they are not affected
• Monitor network activity for potential exploitation attempts
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• 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 the vulnerability in Junos OS and Junos OS Evolved, specifically in the rpd process, which allows a configured MVPN neighbor to cause a denial of service via a BGP MVPN update when an inter-region segmented VRF with 'protocols mvpn inter-region-template' is configured.

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.