CVE-2026-101981

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Stack-based Buffer Overflow in Juniper Networks 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 routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent LDP peer to cause an rpd crash or execute arbitrary code via a malformed LDP Label Mapping message.

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-2026-101981

EUVD

EUVD-2026-101416

Affected Vendors & Products

Vendor	Product	Version / Range
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 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 routing protocol daemon (rpd). It occurs when an unauthenticated adjacent LDP peer sends a malformed Label Mapping message, causing a crash or allowing arbitrary code execution.

Detection Guidance

Detecting this vulnerability requires monitoring for malformed LDP Label Mapping messages or rpd crashes. Check Juniper device logs for rpd crashes or unexpected behavior. Use network monitoring tools to inspect LDP traffic for malformed packets. Juniper may provide specific detection commands in their security advisories.

Impact Analysis

An attacker within the local network could exploit this to crash the rpd service or execute malicious code, leading to service disruption or unauthorized system access.

Compliance Impact

This vulnerability could lead to unauthorized code execution or service disruption, potentially causing data breaches or loss of sensitive information. Such incidents may violate compliance requirements under GDPR or HIPAA, depending on the affected system's role in processing protected data.

Mitigation Strategies

Update Junos OS and Junos OS Evolved to the latest patched versions immediately to address the stack-based buffer overflow in the routing protocol daemon (rpd). Disable LDP peering with untrusted adjacent peers until patches are applied.

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