D-Link DIR-605 Router

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

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 16 May 2024, 965 days after the CVE record was published.

How likely is exploitation in the next 30 days?

87%

EPSS score, percentile 99.7 of all scored records

How severe?

7.5 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 6 Jun 2024. This vulnerability affects legacy D-Link products. Full text

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

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.

CISA due date for this action: 6 June 2024.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

CISA added CVE-2021-40655 to its Known Exploited Vulnerabilities (KEV) catalog on 16 May 2024.
CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
The due date CISA sets for the required action is 6 Jun 2024.
The CVE record was published on 24 Sep 2021, 965 days before it was added to KEV.
The CVE record carries a CVSS v3.1 base score of 7.5 (High), taken from CISA's enrichment of the record.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 87% (percentile 99.7), as of 28 Oct 2026.
CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

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

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE-863: Incorrect Authorization

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

Date	Event
24 Sep 2021	CVE record published
16 May 2024	Added to CISA KEV
6 Jun 2024	CISA due date for the required action
21 Oct 2025	CVE record last updated

References

More exploited D-Link vulnerabilities

CVE-2025-29635: D-Link DIR-823X Command Injection Vulnerability (added 24 Apr 2026)
CVE-2022-37055: D-Link Routers Buffer Overflow Vulnerability (added 8 Dec 2025)
CVE-2020-25078: D-Link DCS-2530L and DCS-2670L Devices Unspecified Vulnerability (added 5 Aug 2025)
CVE-2020-25079: D-Link DCS-2530L and DCS-2670L Command Injection Vulnerability (added 5 Aug 2025)
CVE-2022-40799: D-Link DNR-322L Download of Code Without Integrity Check Vulnerability (added 5 Aug 2025)
CVE-2024-0769: D-Link DIR-859 Router Path Traversal Vulnerability (added 25 Jun 2025)