CVE-2026-102185 Juniper Networks CVE debrief

Who should care

Network administrators and security teams responsible for Junos OS and Junos OS Evolved devices should assess exposure and prioritize patching or mitigation. They should verify affected versions and apply patches or mitigations as available from Juniper Networks. Security teams should also monitor network devices for potential denial of service conditions and review compensating controls for exposed systems.

Why it matters

CVE-2026-102185 is a high-severity vulnerability in Junos OS and Junos OS Evolved that can cause a denial of service condition. Network administrators and security teams should prioritize verification of affected versions and apply patches or mitigations as available.

• Denial of service condition via EVPN multihoming with preference-based designated-forwarder election
• Potential network instability or downtime
• Need for verification of Junos OS and Junos OS Evolved versions
• Priority for applying patches or mitigations

Technical summary

A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote network attacker to cause a denial of service via EVPN multihoming with preference-based designated-forwarder election. The vulnerability can cause network instability or downtime. Affected versions of Junos OS and Junos OS Evolved need to be verified and patched or mitigated as available from Juniper Networks. The vulnerability has a high severity score of 7.5.

Defensive priority

Network administrators and security teams should prioritize verification of Junos OS and Junos OS Evolved versions, and apply patches or mitigations as available.

Recommended defensive actions

• Verify Junos OS and Junos OS Evolved versions against the affected versions list
• Apply patches or mitigations as available from Juniper Networks
• Monitor network devices for potential denial of service conditions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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

Evidence notes

The CVE record and source item provide details on the vulnerability in Junos OS and Junos OS Evolved, but specific details on exploitation or impact are limited. Evidence is based on CVE Program and NVD sources. Defenders should verify affected versions and apply patches or mitigations as available from Juniper Networks. The source item provides details on the vulnerability, but additional verification is needed to confirm affected scope and severity.

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.