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PatchSiren cyber security CVE debrief

CVE-2026-102018 Juniper Networks CVE debrief

A denial-of-service vulnerability exists in Juniper Networks Junos OS and Junos OS Evolved when bidirectional PIM is enabled. An unauthenticated adjacent attacker can cause a disruption in the routing service via a malformed PIM Bidir message. This vulnerability affects Junos OS and Junos OS Evolved, potentially disrupting routing services. Administrators should assess exposure and apply patches or updates as necessary to prevent exploitation. The vulnerability is triggered by a malformed PIM Bidir message, which could lead to a denial-of-service condition.

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

Junos OS and Junos OS Evolved administrators and security teams should assess exposure and apply patches or updates as necessary. They should also verify affected versions, monitor for malformed PIM Bidir messages, and adjust configurations as necessary to mitigate the vulnerability. Additionally, they should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-102018 is a medium-severity denial-of-service vulnerability in Junos OS and Junos OS Evolved. Administrators should assess exposure, apply patches, and monitor for malformed PIM Bidir messages.

  • Disruption of routing service when bidirectional PIM is enabled
  • Potential for denial-of-service condition
  • Need for patching or updating affected versions
  • Verification of instance exposure and configuration adjustments

Technical summary

A NULL Pointer Dereference vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a denial-of-service condition via a malformed PIM Bidir message. The vulnerability is specifically related to the handling of PIM Bidir DF-Election messages. Affected versions of Junos OS and Junos OS Evolved require patching or updating to prevent exploitation.

Defensive priority

Medium priority for Junos OS and Junos OS Evolved administrators to assess exposure and apply patches

Recommended defensive actions

  • Assess exposure of Junos OS and Junos OS Evolved instances to the denial-of-service vulnerability
  • Verify affected versions and apply patches or updates as available
  • Monitor for malformed PIM Bidir messages and adjust configurations as necessary

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or impact. The vendor advisory is available for affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102018 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102018

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

  • CVE-2026-102018 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102018

    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.