Security readout for executives and security teams
Plain-English summary
This issue affects the D-Link DSL-3782 EU router firmware reported as v1.01:EU/v1.03. An authenticated remote user can crash or disrupt the device through its web interface, creating a denial-of-service risk for networks relying on the router.
Executive priority
Treat this as a moderate operational resilience issue. It is not documented as actively exploited, but affected routers can be disrupted if an attacker has admin access, which may affect site connectivity.
Technical view
The vulnerability is a buffer overflow in /cgi-bin/New_GUI/Igmp.asp. A long value in the igmpsnoopEnable HTTP parameter can be sent by an authenticated remote attacker to trigger denial of service. The source bundle does not provide CVSS, CWE, patch details, or proof of exploitation.
Likely exposure
Exposure is likely limited to deployments using the affected D-Link DSL-3782 EU firmware with the administrative web interface reachable to an attacker who can authenticate.
Exploitation context
The provided bundle marks KEV as false and cites no active exploitation. Authentication is required, so risk increases where router admin interfaces are exposed, credentials are weak, or administrative accounts are compromised.
Researcher notes
Evidence is sparse: no CVSS vector, CWE, exploit status, or fix is included. Validation should focus on affected firmware, authenticated management exposure, and vendor bulletin interpretation, without assuming broader D-Link product impact.
Mitigation direction
- Review D-Link SAP10245 and the security bulletin for vendor guidance.
- Restrict web administration to trusted management networks only.
- Disable external access to the router administrative interface where possible.
- Use strong, unique administrative credentials.
- Replace or retire affected devices if vendor support is unavailable.
Validation and detection
- Inventory D-Link DSL-3782 EU devices and firmware versions.
- Confirm whether router web administration is reachable from untrusted networks.
- Review administrative account exposure and credential hygiene.
- Check D-Link guidance for firmware availability or lifecycle status.
- Monitor for router crashes or unexpected management-interface activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-40284 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dlink.com/en/security-bulletin/CVE reference · x_refsource_MISC
- https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10245CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.