CVE-2026-127275
Deferred Deferred - Pending Action

Authentication Bypass in Linksys EA8100 Firmware

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulDB

Description
A vulnerability was determined in Linksys EA8100 1.0.3.216940. This issue affects the function SetRemoteSetting/SetUnsecuredWiFiWarning of the file ui_server.lua of the component JNAP API. This manipulation of the argument isEnabled/enabled causes missing authentication. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. 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-2026-127275
EUVD
EUVD-2026-124804

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-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is in the Linksys EA8100 router firmware version 1.0.3.216940. It affects the JNAP API function SetRemoteSetting/SetUnsecuredWiFiWarning in the ui_server.lua file. The issue allows missing authentication due to manipulation of the isEnabled/enabled argument. The attack can be initiated remotely and has been publicly disclosed.

Detection Guidance

To detect this vulnerability, monitor network traffic for unauthenticated JNAP API requests targeting SetRemoteSetting or SetUnsecuredWiFiWarning endpoints. Check for missing authentication in responses from ui_server.lua. Inspect for excessive failed admin login attempts due to lack of rate limiting.

Impact Analysis

An attacker could exploit this to gain unauthorized access to the router's settings without authentication. This may allow them to change Wi-Fi configurations, disable security features, or intercept network traffic. Since the exploit is public, the risk of misuse is high.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data transmitted over the network, violating confidentiality requirements in GDPR and HIPAA. Organizations using this router may face compliance violations, data breaches, and potential legal penalties.

Mitigation Strategies

Immediately disable remote access to the JNAP API on Linksys EA8100 devices and update to the latest firmware if available. Isolate affected devices from critical network segments until a patch is applied.

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