CVE-2026-102023

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Reachable Assertion in Juniper Networks Junos OS Evolved

Publication date: 2026-10-14

Last updated on: 2026-10-16

Assigner: Juniper Networks, Inc.

Description

A Reachable Assertion vulnerability in fwstatsd of Juniper Networks Junos OS Evolved allows an authenticated network attacker to cause a denial of service via an SNMP firewall-counter MIB query when at least one firewall counter is configured.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-102023

EUVD

EUVD-2026-101348

Affected Vendors & Products

Vendor	Product	Version / Range
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 is a Reachable Assertion vulnerability in fwstatsd of Juniper Networks Junos OS Evolved. An authenticated network attacker can exploit it by sending an SNMP firewall-counter MIB query when at least one firewall counter is configured, causing a denial of service.

Detection Guidance

This vulnerability can be detected by checking for the presence of fwstatsd and firewall counter configurations in Juniper Networks Junos OS Evolved. Monitor for unexpected crashes or high CPU usage in fwstatsd during SNMP firewall-counter MIB queries. Check logs for assertion failures or denial of service events related to SNMP queries.

Impact Analysis

It allows an attacker to disrupt services by triggering a denial of service, potentially leading to network outages or degraded performance for systems running affected Juniper Networks Junos OS Evolved versions.

Compliance Impact

This vulnerability causes a denial of service via SNMP firewall-counter MIB queries, which could disrupt network monitoring and logging. Such disruptions may impact compliance with standards like GDPR or HIPAA by impairing data integrity, availability, or audit capabilities, especially if logging or monitoring systems are affected.

Mitigation Strategies

Apply the latest security patches from Juniper Networks for Junos OS Evolved to address the Reachable Assertion vulnerability in fwstatsd. Disable SNMP firewall-counter MIB queries if not required. Monitor system logs for abnormal fwstatsd behavior or crashes.

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