CVE-2026-101942: CWE-130 Improper Handling of Length Parameter Inconsistency in Juniper Networks Junos OS
Description
CVE-2026-101942 is a high-severity vulnerability in Juniper Networks Junos OS and Junos OS Evolved affecting the routing protocol daemon (rpd). It involves improper handling of length parameter inconsistencies in EVPN Type-3 or Type-4 routes. An unauthenticated network attacker can exploit this by sending malformed EVPN routes from a configured EVPN peer, causing a denial of service (DoS) during route re-advertisement.
CVSS v3.1
Score 7.5high
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
pkg:rpm/juniper/junos-ospkg:rpm/juniper/junos-os-evoRun 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 (CWE-130) in Juniper Junos OS and Junos OS Evolved arises from improper handling of length parameter inconsistencies in the routing protocol daemon (rpd) when processing EVPN Type-3 or Type-4 routes. An unauthenticated attacker on the network can send malformed EVPN routes from a configured EVPN peer, triggering a denial of service condition during the re-advertisement process. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low complexity, no privileges or user interaction required, and impact limited to availability (DoS).
Potential Impact
Successful exploitation results in denial of service of the routing protocol daemon, potentially disrupting network routing and connectivity. There is no impact on confidentiality or integrity reported. The attack requires network access and a configured EVPN peer relationship.
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. Until a patch is available, restrict network access to trusted EVPN peers and monitor for malformed EVPN route advertisements to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T16:22:33.605Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb6702cdf04f6569794fc
Added to database: 10/14/2026, 17:05:52 UTC
Last enriched: 10/14/2026, 17:34:52 UTC
Last updated: 10/14/2026, 19:48:45 UTC
Views: 3
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