CVE-2026-101979

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Stack-based Buffer Overflow in Juniper Networks Junos OS

Publication date: 2026-10-14

Last updated on: 2026-10-15

Assigner: Juniper Networks, Inc.

Description

A Stack-based Buffer Overflow vulnerability in the authd Juniper Networks Junos OS and Junos OS Evolved allows a network attacker with SNMP read access to execute code with root privileges or cause a denial of service via a specific SNMP packet, when SNMP and AAA are enabled.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-101979

EUVD

EUVD-2026-101415

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 vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It allows a network attacker with SNMP read access to execute code with root privileges or cause a denial of service by sending a specific SNMP packet when SNMP and AAA are enabled.

Detection Guidance

Detecting this vulnerability requires checking if SNMP and AAA are enabled on Juniper Junos OS or Junos OS Evolved systems. Monitor for unusual SNMP traffic or crashes. Juniper recommends reviewing logs for authd-related errors or unexpected behavior.

Impact Analysis

An attacker could gain root-level access to your system, allowing them to take full control. They could also disrupt services by causing a denial of service, leading to downtime and potential loss of critical network functions.

Compliance Impact

This vulnerability allows remote code execution with root privileges via SNMP, 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 SNMP read access if not required.
Disable AAA if SNMP is not needed.
Apply patches or updates from Juniper Networks.
Restrict SNMP access to trusted sources only.

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