Which products and versions are affected by CVE-2021-40655?

Affected: Dir-605l Firmware (Dlink) versions 2.01mt. The full list is in the CVE brief.

Is CVE-2021-40655 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 16, 2024.

Is CVE-2021-40655 in the CISA KEV catalog?

Yes. It was added on May 16, 2024 with a federal remediation due date of Jun 6, 2024.

Is there a public exploit for CVE-2021-40655?

Public exploit code is available.

Is there a fix for CVE-2021-40655?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-40655 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-40655

HighExploitedPublic exploit

An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT.

Published Sep 24, 2021 · Updated Nov 10, 2025

Key Facts

Patch immediately

CVE-2021-40655 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Dir-605l Firmware (Dlink).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 16, 2024. Public exploit code is available.
EPSS estimates a 87% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS (30-day exploit likelihood)

87%

Higher than 99.7% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-40655 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	May 16, 2024	Jun 6, 2024	Not reported
Industry KEV feed	May 16, 2024	Jun 6, 2024	Not reported
CIRCL KEV	May 16, 2024	Jun 6, 2024	Not reported
ENISA EUVD	May 16, 2024	n/a	Not reported

Required action: This vulnerability affects legacy D-Link products. All associated hardware revisions have reached their end-of-life (EOL) or end-of-service (EOS) life cycle and should be retired and replaced per vendor instructions.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
Dir-605l FirmwareDlink	2.01mt	n/a

Timeline

Publicly disclosed
Sep 24, 2021
Added to CISA KEV
May 16, 2024
Added to Industry KEV feed
May 16, 2024
Added to CIRCL KEV
May 16, 2024
Added to ENISA EUVD
May 16, 2024
Last updated
Nov 10, 2025

Weakness Type

CWE-863 Incorrect Authorization

References

advisoryhttps://www.dlink.com/en/security-bulletin/
exploitVulnCheck exploitation report
exploithttps://github.com/Ilovewomen/D-LINK-DIR-605/
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report

3 more references in the full CVE brief

FAQ

Common Questions.

An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT.
Affected: Dir-605l Firmware (Dlink) versions 2.01mt. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 16, 2024.
Yes. It was added on May 16, 2024 with a federal remediation due date of Jun 6, 2024.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-40655 Running On Your Attack Surface?

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