Authentication Bypass in Totolink A3002MU Router

A weakness has been identified in Totolink A3002MU 1.0.0-B20230403.1455. The impacted element is the function sub_40FCFC of the file /bin/boa of the component Authentication Check. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-105284 represents a critical authentication bypass vulnerability affecting Totolink A3002MU routers running firmware version 1.0.0-B20230403.1455. The flaw exists in the authentication check function within the /bin/boa web server component, allowing attackers to bypass authorization controls entirely. With a CVSS score of 10.0, this vulnerability enables unauthenticated remote attackers to gain unauthorized access to router administration functions, potentially leading to complete device compromise. Small office and home users relying on these routers for network security face immediate risk, as the exploit has already entered public circulation and requires no special privileges or user interaction to execute.

Casky's 283 mapped security skills detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK Privilege Escalation (TA0004) and Credential Access (TA0006) techniques through Claude's extended reasoning capabilities. Practitioners leveraging Casky would identify behavioral indicators including unexpected authentication function bypasses in web server logs, improper authorization checks on sensitive endpoints like /bin/boa, and anomalous administrative access without corresponding credential validation events. The platform's correlation of CWE-266 (Improper Privilege Management) and CWE-285 (Improper Authorization) with TA0004 and TA0006 techniques enables security teams to spot exploitation attempts that manipulate authorization logic, recognize lateral movement patterns post-breach, and detect credential harvesting attempts that may follow successful authentication bypass. Detection would manifest as failed authorization checks followed by successful command execution, unusual administrative API calls, or configuration changes originating from unauthenticated sessions.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-105284.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-105284

Casky has 283 skills that investigate the attack patterns behind CVE-2026-105284. Run one and get CVSS-scored findings in 3 minutes.

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