CVE-2026-102067 Juniper Networks CVE debrief

Who should care

Network administrators and security teams responsible for managing Junos OS and Junos OS Evolved systems should assess exposure and prioritize patching or mitigation efforts. They should review and adjust network configurations to prevent potential attacks and verify that L2 LSP support is not enabled on affected systems or configure mitigations to prevent exploitation. Additionally, they should monitor network traffic for suspicious RSVP packets and plan

Why it matters

CVE-2026-102067 is a denial-of-service vulnerability in Junos OS and Junos OS Evolved that requires patching or mitigation to prevent potential attacks.

• Denial-of-service attacks may occur via crafted RSVP packets.
• Verification of L2 LSP support configuration and mitigation is necessary.
• Patching or updating affected systems is required to prevent exploitation.
• Network administrators should review and adjust network configurations to prevent potential attacks.

Technical summary

An Improper Validation of Specified Quantity in Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a denial of service via a crafted RSVP packet when L2 LSP support is enabled. The vulnerability is caused by a lack of proper validation of the quantity of input in the rpd, which can lead to a denial-of-service attack. Network administrators and security teams should be aware of the potential impact and take steps to mitigate or patch the vulnerability.

Defensive priority

Network administrators should prioritize patching or mitigating this vulnerability to prevent potential denial-of-service attacks.

Recommended defensive actions

• Review and apply patches or updates for Junos OS and Junos OS Evolved to prevent potential denial-of-service attacks.
• Verify that L2 LSP support is not enabled on affected systems or configure mitigations to prevent exploitation.
• Monitor network traffic for suspicious RSVP packets and adjust network configurations as needed.
• 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 Specified Quantity in Input in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved. The vulnerability allows an adjacent unauthenticated attacker to cause a denial of service via a crafted RSVP packet when L2 LSP support is enabled. The source item and CVE record provide additional information on L

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.