CVE-2026-127277
Deferred Deferred - Pending Action

Improper Initialization in Linksys EA8100 SMB Service via ANON_ACCESS

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulDB

Description
A security flaw has been discovered in Linksys EA8100 1.0.3.216940. The affected element is an unknown function of the file etc/init.d/service_smbd.sh of the component SMB Service. Performing a manipulation of the argument ANON_ACCESS results in improper initialization. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-127277
EUVD
EUVD-2026-124793

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Linksys EA8100 1.0.3.216940

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-665 The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

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Executive Summary

A vulnerability exists in Linksys EA8100 version 1.0.3.216940 where the SMB service improperly initializes due to a manipulation of the ANON_ACCESS argument in the file etc/init.d/service_smbd.sh. This flaw allows remote attackers to exploit it, and a public exploit is already available.

Detection Guidance

Detecting this vulnerability requires checking for unauthenticated access to JNAP actions like GetWANStatus, GetWANStatus3, and IsAdminPasswordDefault. Use network scanning tools like curl or nmap to send requests to these endpoints without authentication. Example: curl http://<router-ip>/JNAP/.../GetWANStatus. Also verify if Host header validation is missing by sending requests with arbitrary Host headers.

Impact Analysis

This vulnerability can lead to unauthorized remote access, allowing attackers to execute arbitrary code, steal data, or take control of the affected device. Since the exploit is public, the risk of attacks is high.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using this device may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Immediately disable the SMB service on the Linksys EA8100 device if possible. Check for firmware updates from Linksys, though no response was received from the vendor. Isolate the device from the network to prevent remote exploitation. Monitor network traffic for unusual SMB-related activity.

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