CVE-2026-101969: CWE-20 Improper Input Validation in Juniper Networks Junos OS
Description
An Improper Input Validation 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 via a malformed PIM Hello message received on an IPv6-enabled PIM interface.
CVSS v3.1
Score 6.5medium
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
pkg:rpm/juniper/junos-ospkg:rpm/juniper/junos-os-evolvedRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-101969) involves improper input validation in the rpd process of Juniper Networks Junos OS and Junos OS Evolved. Specifically, the flaw allows an unauthenticated attacker with adjacent network access to send a malformed Protocol Independent Multicast (PIM) Hello message on an IPv6-enabled PIM interface, triggering a denial of service condition. The issue affects a range of Junos OS and Junos OS Evolved versions prior to certain fixed releases. The vulnerability does not impact confidentiality or integrity but causes service disruption (availability impact).
Potential Impact
An unauthenticated adjacent attacker can cause a denial of service by exploiting improper input validation in the rpd process via malformed PIM Hello messages on IPv6-enabled PIM interfaces. This results in service disruption without affecting confidentiality or integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor Juniper Networks advisories for updates and apply patches once available. Until then, consider limiting adjacent network access to IPv6-enabled PIM interfaces if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T16:31:35.502Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb6702cdf04f656979503
Added to database: 10/14/2026, 17:05:52 UTC
Last enriched: 10/14/2026, 17:34:21 UTC
Last updated: 10/14/2026, 20:49:11 UTC
Views: 6
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