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CVE-2026-102039 Juniper Networks CVE debrief

CVE-2026-102039 debrief based on the supplied source corpus. The vulnerability affects Junos OS and Junos OS Evolved, causing a denial of service via a malformed RSVP Path message. Network administrators and security teams should assess exposure and apply patches or mitigations as needed. This vulnerability has a medium severity and is related to a NULL Pointer Dereference in the rpd process. The CVE record was published on 2026-10-14T16:51:20.511Z and has not been modified since then. Affected product deployments should be identified, and owners assigned for follow-up. Official advisories and CVE records should be reviewed to validate affected scope, severity, and vendor guidance.

Vendor
Juniper Networks
Product
Junos OS
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Network administrators and security teams using Junos OS and Junos OS Evolved should assess exposure and apply patches or mitigations as needed.

Why it matters

CVE-2026-102039 is a medium-severity vulnerability in Junos OS and Junos OS Evolved that can cause routing-process denial of service. Network administrators and security teams should assess exposure, apply patches or mitigations, and monitor network traffic for suspicious activity.

  • Denial of service to routing processes
  • Potential network instability or downtime
  • Need for verification of affected versions and patch application
  • Possible impact on network security posture

Technical summary

A NULL Pointer Dereference 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 a malformed RSVP Path message received on an EVPL LMP control channel. The vulnerability has a medium severity and affects Junos OS and Junos OS Evolved. The CVE record and source item provide details on this vulnerability, and network administrators should review and apply Juniper Networks' security patches for affected versions.

Defensive priority

Medium priority for Junos OS and Junos OS Evolved users.

Recommended defensive actions

  • Review and apply Juniper Networks' security patches for affected Junos OS and Junos OS Evolved versions.
  • Verify that EVPL LMP control channels are properly configured and secured.
  • Monitor network traffic for suspicious RSVP Path messages.

Evidence notes

The CVE record and source item provide details on a NULL Pointer Dereference vulnerability in Junos OS and Junos OS Evolved, which allows an adjacent attacker to cause a denial of service via a malformed RSVP Path message received on an EVPL LMP control channel.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102039 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102039

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-102039 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102039

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.