CVE-2026-101962 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 remediation. They should verify exposure by checking Junos OS and Junos OS Evolved versions against the provided affected versions list, apply patches or updates provided by Juniper Networks to address the vulnerability, and monitor network devices for unusual activity or crashes related to BGP EVPN signaling.

Why it matters

CVE-2026-101962 is a vulnerability in Junos OS and Junos OS Evolved that can lead to rpd crashes on malformed BGP EVPN multicast updates. Network administrators and security teams should verify exposure, prioritize remediation, and monitor network devices for potential service disruptions.

• Potential service disruption due to rpd crashes.
• Need for verification of exposure and affected versions.
• Priority for applying patches or updates to prevent exploitation.
• Monitoring network devices for unusual activity or crashes related to BGP EVPN signaling.

Technical summary

A vulnerability in the routing protocol daemon (rpd) of Junos OS and Junos OS Evolved allows an attacker to cause an rpd crash by sending a specifically malformed BGP EVPN multicast update, which is an Improper Handling of Length Parameter Inconsistency vulnerability. This can lead to potential service disruptions due to rpd crashes. Network administrators and security teams should prioritize verification of exposure and remediation due to the potential for service disruption. The vulnerability affects Junos OS and Junos OS Evolved, and defenders should verify exposure and apply patches or updates provided by Juniper Networks.

Defensive priority

Network administrators and security teams should prioritize verification of exposure and remediation due to the potential for service disruption.

Recommended defensive actions

• Verify exposure by checking Junos OS and Junos OS Evolved versions against the provided affected versions list.
• Apply patches or updates provided by Juniper Networks to address the vulnerability.
• Monitor network devices for unusual activity or crashes related to BGP EVPN signaling.
• Review and update incident response plans to include procedures for handling potential service disruptions.
• 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.

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 attacker can cause an rpd crash by sending a specifically malformed BGP EVPN multicast update. Defenders should verify exposure by checking Junos OS and Junos OS Evolved versions against the provided affected versions list and apply patches or updates provided by Juniper Networks to address the vulnerability.

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.