CVE-2026-102011 Juniper Networks CVE debrief

Who should care

Network administrators and security teams responsible for Juniper Networks Junos OS and Junos OS Evolved systems should assess exposure and prioritize patching. They should review configurations, monitor for suspicious activity, and verify patch application. Additionally, operators and platform teams should ensure that their systems are updated and secured against this vulnerability.

Why it matters

CVE-2026-102011 is a medium-severity vulnerability in Juniper Networks Junos OS and Junos OS Evolved that can cause a denial of service. Network administrators and security teams should prioritize verifying and applying patches, reviewing configurations, and monitoring for suspicious activity.

• Denial of service via LDP session exploitation
• Potential for network instability or downtime
• Need for verification of patch application and configuration updates
• Possible impact on network availability and reliability

Technical summary

A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to cause a denial of service via an established LDP session when two misconfigured neighbors advertise the same transport address on a link-protected interface. The vulnerability can cause network instability or downtime, emphasizing the need for verification of patch application and configuration updates. Affected systems require immediate attention from network administrators and security teams.

Defensive priority

Network administrators and security teams should prioritize verifying and applying patches for Juniper Networks Junos OS and Junos OS Evolved, especially for versions prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2.

Recommended defensive actions

• Verify and apply patches for Juniper Networks Junos OS and Junos OS Evolved
• Review and update configurations for LDP link protection
• Monitor for suspicious LDP session activity
• Perform vulnerability assessment to identify exposed assets
• Implement compensating controls for exposed systems
• Review network configurations for potential weaknesses
• Track patch application and configuration updates

Evidence notes

The CVE record and source item provide details on a Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved. An adjacent attacker can cause a denial of service via an established LDP session when two misconfigured neighbors advertise the same transport address on a link-protected interface.

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.