CVE-2026-102058

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Reachable Assertion in Juniper Junos OS BFD Daemon

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description

A Reachable Assertion vulnerability in the bfdd daemon of Juniper Networks Junos OS and Junos OS Evolved platforms allows an unauthenticated adjacent attacker to cause a denial of service by restarting the daemon via crafted BFD session traffic.

CVSS Scores

EPSS Scores

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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-2026-102058

EUVD

EUVD-2026-101383

Affected Vendors & Products

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

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability is a Reachable Assertion flaw in the bfdd daemon of Juniper Networks Junos OS and Junos OS Evolved. An unauthenticated attacker on the same network segment can exploit it by sending specially crafted BFD session traffic, causing the daemon to restart and leading to a denial of service.

Detection Guidance

This vulnerability can be detected by monitoring the bfdd daemon for crashes or unexpected restarts. Check system logs for bfdd-related errors or core dumps. Use commands like 'show system processes | match bfdd' to verify if the daemon is running. Monitor network traffic for crafted BFD session packets that may trigger the issue.

Impact Analysis

The vulnerability can disrupt network services by repeatedly restarting the bfdd daemon, which may cause intermittent connectivity issues or complete loss of BFD functionality. This impacts systems relying on BFD for session monitoring and failover.

Compliance Impact

This vulnerability causes a denial of service by crashing the bfdd daemon, which could disrupt network services. Such disruptions may lead to violations of availability requirements in GDPR or HIPAA, potentially impacting compliance if critical systems are affected.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved patches from Juniper Networks to address the bfdd daemon vulnerability. Monitor BFD session traffic for unusual patterns that may indicate exploitation attempts.

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