CVE-2026-102049

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Stack-based Buffer Overflow in Juniper Junos OS and Junos OS Evolved

Publication date: 2026-10-14

Last updated on: 2026-10-16

Assigner: Juniper Networks, Inc.

Description

A Stack-based Buffer Overflow vulnerability in the l2cpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a denial of service or execute arbitrary code with root privileges via LLDP traffic received on an interface with Unified Access Policy enabled.

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-2026-102049

EUVD

EUVD-2026-101373

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-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow in Juniper Networks Junos OS and Junos OS Evolved's l2cpd process. It occurs when processing LLDP traffic on an interface with Unified Access Policy enabled. An adjacent unauthenticated attacker can exploit this to cause a denial of service or execute arbitrary code with root privileges.

Detection Guidance

Detection requires monitoring for crashes or unusual behavior in the l2cpd process on Juniper devices with Unified Access Policy enabled. Check logs for LLDP-related crashes or root-level code execution attempts. Juniper may provide specific detection tools or updates.

Impact Analysis

An attacker could crash your system (denial of service) or take full control of it (arbitrary code execution with root privileges) by sending specially crafted LLDP traffic to an affected interface. This could disrupt network operations or lead to unauthorized system access.

Compliance Impact

This vulnerability allows remote code execution with root privileges, which could lead to unauthorized access to sensitive data. This may violate GDPR's data protection requirements and HIPAA's security rules for protected health information if exploited.

Mitigation Strategies

Disable Unified Access Policy on interfaces receiving LLDP traffic or upgrade to a patched version of Junos OS or Junos OS Evolved. Monitor for unusual l2cpd process behavior or crashes.

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