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CVE-2021-40655 (GCVE-0-2021-40655)

Vulnerability from cvelistv5 – Published: 2021-09-24 20:11 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
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
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 15:44 UTC
CWE
  • n/a
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
dlink dir-605l_firmware Affected: 2.01mt
    cpe:2.3:o:dlink:dir-605l_firmware:2.01mt:*:*:*:*:*:*:*
Create a notification for this product.
dlink dir-605l Affected: b2
    cpe:2.3:h:dlink:dir-605l:b2:*:*:*:*:*:*:*
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6695f47b-f1c5-4151-bf40-31d885d1dfca

Vulnerability ID: CVE-2021-40655

Status: Confirmed

Status Updated: 2024-05-16 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-05-16
Asserted: 2024-05-16
Scope
Notes: KEV entry: D-Link DIR-605 Router Information Disclosure Vulnerability | Affected: D-Link / DIR-605 Router | Description: 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. | 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. | Due date: 2024-06-06 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://legacy.us.dlink.com/pages/product.aspx?id=2b09e95d90ff4cb38830ecc04c89cee5; https://nvd.nist.gov/vuln/detail/CVE-2021-40655
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-863
Feed CISA Known Exploited Vulnerabilities Catalog
Product DIR-605 Router
Due Date 2024-06-06
Date Added 2024-05-16
Vendorproject D-Link
Vulnerabilityname D-Link DIR-605 Router Information Disclosure Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 18586577-fdfb-41df-ba8d-69ff532a4f8a

Vulnerability ID: CVE-2021-40655

Status: Confirmed

Status Updated: 2024-05-16 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-05-16
Asserted: 2024-05-16
Scope
Notes: KEVIntel entry: 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... | Affected: D-Link / DIR-605 B2 Firmware | CVSS: 7.5 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor D-Link
Product DIR-605 B2 Firmware
Added Date 2024-05-16T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "source": "Red Hat CSAF VEX",
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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.