D-Link DIR-605 Router Information Disclosure Vulnerability (CVE-2021-40655)

D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a post request to the /getcfg.php page.

Published Sep 24, 2021 · Updated May 17, 2026

Why patchRisk explained in plain English

Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss. Federal agencies are required to remediate by 2024-06-06 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Incorrect Authorization (CWE-863) vulnerability in D-Link DIR-605 Router. An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT. An attacker can obtain a user name and password by forging a post request to the / getcfg.php page Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security

●Running dir-605l firmware: 2.01mt

Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://github.com/Ilovewomen/D-LINK-DIR-605/

How to patch

Manual remediation steps

Identify affected hosts: query inventory for general installs in scope.

Apply the vendor security update referenced in CVE-2021-40655's advisory. No specific KB/version is encoded yet — consult the linked MSRC/vendor URL.

Verify the fix per the vendor's published verification steps.

Document the remediation in your change ticket and re-scan with your vulnerability scanner to confirm closure.

PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2021-40655 ↗ MSRC Advisory ↗ NVD ↗ Vendor Advisory