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CVE Record

CVE-2009-4821: The D-Link DIR-615 with firmware 3.10NA does not require administrative authentication for apply.cgi, which...

The D-Link DIR-615 with firmware 3.10NA does not require administrative authentication for apply.cgi, which allows remote attackers to (1) change the admin password via the admin_password parameter, (2) disable the security requirement for the Wi-Fi network via unspecified vectors, or (3) modify DNS settings via unspecified vectors.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's Takehigh

Analyst readout for executives and security teams

Plain-English summary

A D-Link DIR-615 router running firmware 3.10NA exposed a configuration endpoint without requiring admin login. A remote attacker could change the router admin password, weaken Wi-Fi security, or alter DNS settings. Business risk is loss of control over a small-office or remote-site router and possible traffic redirection.

Executive priority

Prioritize remediation if any affected DIR-615 device remains in service. The issue enables unauthenticated configuration changes with direct business impact, but urgency depends on whether these legacy routers are still deployed and reachable.

Technical view

CVE-2009-4821 is an unauthenticated access-control flaw in apply.cgi on D-Link DIR-615 firmware 3.10NA. The CVE states attackers can change the admin_password parameter, disable Wi-Fi security requirements through unspecified vectors, or modify DNS settings through unspecified vectors. No CVSS, CWE, or vendor fix is provided in the source bundle.

Likely exposure

Exposure is limited to environments still using D-Link DIR-615 devices with firmware 3.10NA, especially if router management interfaces are reachable from untrusted networks. The provided affected-product metadata is incomplete, so confirm model and firmware directly from asset records or device administration data.

Exploitation context

The CVE describes remote attacker capability, and the source list includes a public write-up labeled as a remote exploit. However, the bundle does not provide KEV listing or current evidence of active exploitation. Treat exploit availability as historical public knowledge, not proof of present exploitation.

Researcher notes

The source bundle lacks CVSS, CWE, complete CPE data, and vendor remediation detail. The vulnerable endpoint and admin_password impact are named, but Wi-Fi and DNS vectors are unspecified. Do not assume broader D-Link model coverage without additional vendor evidence.

Mitigation direction

  • Identify and remove D-Link DIR-615 firmware 3.10NA from production networks.
  • Check D-Link guidance for fixed firmware or replacement recommendations.
  • Restrict router administration interfaces to trusted management networks only.
  • Change router admin passwords and review DNS and Wi-Fi security settings.
  • Replace unsupported or unpatchable devices.

Validation and detection

  • Inventory routers by model, hardware revision, and firmware version.
  • Confirm whether any DIR-615 devices run firmware 3.10NA.
  • Review configuration for unexpected DNS servers, Wi-Fi changes, or admin password resets.
  • Verify management interfaces are not exposed to untrusted networks.
  • Check logs or monitoring for unexplained router configuration changes.
Prepared
Confidence
medium
Sources
5

Public sources used

Based on public source material and reviewed before publication.

Potential ATT&CK relevance

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

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Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2009-4821 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.