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Vulnerability record · CVE-2021-40284 · published 9 September 2021

CVE-2021-40284: Dlink dsl-3782 firmware classic buffer overflow vulnerability

Dlink · Dsl 3782 Firmware

D-Link DSL-3782 EU v1.01:EU v1.03 is affected by a buffer overflow which can cause a denial of service. This vulnerability exists in the web interface "/cgi-bin/New_GUI/Igmp.asp". Authenticated remote attackers can trigger this vulnerability by sending a long string in parameter 'igmpsnoopEnable' via an HTTP request.

6.5 CVSS 3.1 Medium EPSS 2.6% · top 15.0% CWE-120 · Classic buffer overflow
6.5CVSS 3.1 base score, v2 6.8
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

D-Link DSL-3782 EU v1.01:EU v1.03 is affected by a buffer overflow which can cause a denial of service. This vulnerability exists in the web interface "/cgi-bin/New_GUI/Igmp.asp". Authenticated remote attackers can trigger this vulnerability by sending a long string in parameter 'igmpsnoopEnable' via an HTTP request.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10245 PatchVendor Advisory
https://www.dlink.com/en/security-bulletin/ Vendor Advisory
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10245 PatchVendor Advisory
https://www.dlink.com/en/security-bulletin/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-8898Dlink dsl-3782 firmware improper authentication vulnerabilityA flaw in the authentication mechanism in the Login Panel of router D-Link DSL-3782 (A1_WI_20170303 || SWVer="V100R001B012" FWVer="3.10.0.24" FirmVer…EPSS 13%8.8CVE-2023-44959Dlink dsl-3782 firmware command injection vulnerabilityAn issue found in D-Link DSL-3782 v.1.03 and before allows remote authenticated users to execute arbitrary code as root via the Router IP Address fie…EPSS 21%8.8CVE-2023-27216Dlink dsl-3782 firmware os command injection vulnerabilityAn issue found in D-Link DSL-3782 v.1.03 allows remote authenticated users to execute arbitrary code as root via the network settings page.EPSS 3.0%8.8CVE-2022-34527Dlink dsl-3782 firmware os command injection vulnerabilityD-Link DSL-3782 v1.03 and below was discovered to contain a command injection vulnerability via the function byte_4C0160.EPSS 4.4%8.8CVE-2022-34528Dlink dsl-3782 firmware out-of-bounds write vulnerabilityD-Link DSL-3782 v1.03 and below was discovered to contain a stack overflow via the function getAttrValue.EPSS 1.5%8.8CVE-2018-17990Dlink dsl-3782 firmware os command injection vulnerabilityAn issue was discovered on D-Link DSL-3782 devices with firmware 1.01. An OS command injection vulnerability in Acl.asp allows a remote authenticated…EPSS 4.5%8.0CVE-2025-25895Dlink dsl-3782 firmware os command injection vulnerabilityAn OS command injection vulnerability was discovered in D-Link DSL-3782 v1.01 via the public_type parameter. This vulnerability allows attackers to e…EPSS 0.96%8.0CVE-2025-25894Dlink dsl-3782 firmware os command injection vulnerabilityAn OS command injection vulnerability was discovered in D-Link DSL-3782 v1.01 via the samba_wg and samba_nbn parameters. This vulnerability allows at…EPSS 0.96%

Source: NIST National Vulnerability Database (record CVE-2021-40284), CISA KEV, FIRST EPSS (scores of 2026-10-06). This page is refreshed as NVD updates the record.