CVE-2026-101993
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Reachable Assertion in Juniper Junos OS via VPLS Signaling Update

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent eBGP peer to cause a denial of service via a VPLS signaling update when automatic site-ID negotiation is enabled.

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Meta Information

Published
2026-10-14
Last Modified
2026-10-14
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-101993
EUVD
EUVD-2026-101478

Affected Vendors & Products

Showing 17 associated CPEs
Vendor Product Version / Range
Juniper Networks Junos OS 0
Juniper Networks Junos OS 23.4
Juniper Networks Junos OS 24.2
Juniper Networks Junos OS 24.4
Juniper Networks Junos OS 25.2
Juniper Networks Junos OS 25.4
Juniper Networks Junos OS 26.2
Juniper Networks Junos OS Evolved 0
Juniper Networks Junos OS Evolved 23.4
Juniper Networks Junos OS Evolved 24.2
Juniper Networks Junos OS Evolved 24.4
Juniper Networks Junos OS Evolved 25.2
Juniper Networks Junos OS Evolved 25.4
Juniper Networks Junos OS Evolved 26.2
Juniper Networks Junos OS Evolved 23.4X100
Juniper Networks Junos OS Evolved 25.2X100
Juniper Networks Junos OS Evolved 25.4X300

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-617 The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

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Executive Summary

This vulnerability is a Reachable Assertion issue in Juniper Networks Junos OS and Junos OS Evolved routing protocol daemon (rpd). It allows an adjacent eBGP peer to trigger a denial of service by sending a VPLS signaling update when automatic site-ID negotiation is enabled.

Detection Guidance

This vulnerability can be detected by monitoring for unexpected rpd crashes or high CPU usage on Juniper devices running affected Junos OS or Junos OS Evolved versions with automatic site-ID negotiation enabled. Check logs for VPLS signaling update errors or reachable assertion failures in the routing protocol daemon.

Impact Analysis

An attacker in the same network could exploit this to cause your Juniper device to crash or become unresponsive, disrupting network services and potentially leading to downtime.

Compliance Impact

This vulnerability causes a denial of service via a VPLS signaling update, which could disrupt network availability. Disruptions may impact systems handling sensitive data, potentially violating compliance requirements for availability in standards like GDPR and HIPAA.

Mitigation Strategies

Disable automatic site-ID negotiation in the routing protocol daemon (rpd) configuration to prevent the vulnerability from being triggered by eBGP peers.

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