CVE-2026-101971 Juniper Networks CVE debrief

Who should care

Network administrators and security teams responsible for managing Junos OS and Junos OS Evolved devices should assess exposure and prioritize patching to prevent potential denial-of-service attacks.

Why it matters

CVE-2026-101971 is a medium-severity vulnerability in Junos OS and Junos OS Evolved that can cause denial-of-service attacks and heap memory corruption via OSPFv3 messages. Network administrators and security teams should prioritize verifying OSPFv3 configurations, assessing exposure, and applying vendor-provided patches to prevent potential attacks.

• Denial-of-service attacks via OSPFv3 messages
• Heap memory corruption on affected devices
• Potential network instability or outages
• Verification of OSPFv3 configurations and exposure

Technical summary

An Allocation of Resources Without Limits or Throttling vulnerability in rpd, the routing protocol daemon, of Juniper Networks Junos OS and Junos OS Evolved platforms allows an unauthenticated adjacent attacker to cause a denial of service and heap memory corruption via OSPFv3 messages on an enabled broadcast interface. The vulnerability affects Junos OS and Junos OS Evolved, and network administrators and security teams should prioritize verifying OSPFv3 configurations, assessing exposure, and applying vendor-provided patches to prevent potential attacks.

Defensive priority

Network administrators and security teams should prioritize verifying OSPFv3 configurations and assessing exposure to potential denial-of-service attacks.

Recommended defensive actions

• Verify OSPFv3 configurations and assess exposure to potential denial-of-service attacks
• Review and apply vendor-provided patches for affected Junos OS and Junos OS Evolved versions
• Monitor network traffic for suspicious OSPFv3 activity
• Consider implementing compensating controls, such as rate limiting or access controls, for OSPFv3 interfaces
• 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

Evidence notes

The CVE record and source item provide details on the vulnerability in Junos OS and Junos OS Evolved. Specific details on exploitation are limited, but it is known that an unauthenticated adjacent attacker can cause a denial of service and heap memory corruption via OSPFv3 messages. Defenders should verify OSPFv3 configurations, assess exposure, and apply vendor-provided patches. The source item and CVE record provide source-provided CVE metadata and official vulnerability assessment. Additional information may be found in vendor-prov

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.