CVE-2026-127273
Deferred Deferred - Pending Action

Authentication Bypass in Linksys EA8100 via JNAP API

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulDB

Description
A vulnerability has been found in Linksys EA8100 1.0.3.216940. This affects the function GetWANStatus/GetWANStatus3/IsAdminPasswordDefault of the component JNAP API. The manipulation leads to missing authentication. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. 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-2026-127273
EUVD
EUVD-2026-124779

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

CVE-2026-127273 affects Linksys EA8100 Router firmware version 1.0.3.216940. It involves two issues: unauthenticated access to sensitive network details via JNAP actions (GetWANStatus, GetWANStatus3, IsAdminPasswordDefault) and missing rate limiting on admin authentication attempts (CheckAdminPassword). Attackers can exploit these remotely without authentication.

Detection Guidance

To detect this vulnerability, monitor network traffic for unauthenticated JNAP API requests targeting GetWANStatus, GetWANStatus3, or IsAdminPasswordDefault. Check for DNS rebinding attempts by inspecting DNS logs for unusual queries. Use tools like Wireshark to capture and analyze HTTP requests to the router's JNAP endpoints.

Impact Analysis

An attacker could gather sensitive network information like MAC addresses, IP addresses, and DNS servers without authentication. They could also perform brute-force attacks on admin passwords due to lack of rate limiting, potentially gaining unauthorized access to the router.

Compliance Impact

This vulnerability exposes sensitive network information without authentication, which could lead to unauthorized access to personal or sensitive data. This may violate GDPR's data protection principles and HIPAA's safeguards for protected health information if exploited.

Mitigation Strategies

Immediately disable remote administration on the router if enabled. Update to the latest firmware if available, though note the device is end-of-life. Block external access to JNAP API endpoints via firewall rules. Implement network segmentation to isolate the router from critical systems.

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