CVE-2021-40655Known exploitationPublic exploitNetwork attack vector

Credential disclosure via unauthenticated configuration export

Published Sep 24, 2021 · Updated Oct 21, 2025

Information disclosure in D-Link DIR-605L B2 firmware 2.01MT allows remote attackers to obtain router credentials via a crafted POST request. The getcfg.php handler accepts an unauthenticated SERVICES=DEVICE.ACCOUNT request with a forged AUTHORIZED_GROUP value and returns stored names and passwords in plaintext. Network access to the web interface is sufficient, and the disclosed credentials grant administrative login access.

CVSS severity7.5
High
EPSS probability86.66%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in D-Link DIR-605L B2 firmware 2.01MT allows remote attackers to obtain router credentials via a crafted POST request. The getcfg.php handler accepts an unauthenticated SERVICES=DEVICE.ACCOUNT request with a forged AUTHORIZED_GROUP value and returns stored names and passwords in plaintext. Network access to the web interface is sufficient, and the disclosed credentials grant administrative login access.

The record

CVE
CVE-2021-40655
Published
Sep 24, 2021
Updated
Oct 21, 2025
Vendor
D-Link
Product
DIR-605L Firmware
Classifications
CWE-863, T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.01mt

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-605L Firmwareversion=2.01mt
D-Link · DIR-605Lversion=b2

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo