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Des 3800Hardware / appliance · Dlink

CVE-2011-3992

HIGH · 10.0 CVSS v2.0 Published 2011-11-03
Fix available
A fix is available. Upgrade to after 4.50 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Buffer overflow in the SSH server functionality on the D-Link DES-3800 with firmware before 4.50B052, DWL-2100AP with firmware before 2.50RC548, and DWL-3200AP with firmware before 2.55RC549 allows remote attackers to execute arbitrary code or cause a denial of service via unspecified vectors.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Buffer overflow vulnerability in the SSH server component of D-Link DES-3800 switches and DWL-2100AP/DWL-3200AP access points. The overflow allows remote attackers to execute arbitrary code or cause denial of service via unspecified vectors. This is a critical remote code execution vulnerability in the SSH daemon.

MitigationUpdate affected devices to firmware versions 4.50B052 (DES-3800), 2.50RC548 (DWL-2100AP), or 2.55RC549 (DWL-3200AP) or later. If firmware updates are unavailable, disable SSH access and use alternative management methods, or restrict network access to management interfaces.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Des 3800Hardware / appliance
Affected:all versions
Des 3800 FirmwareOperating system
Affected:<= 4.50= 4.00
Dwl 2100apHardware / appliance
Affected:all versions
Dwl 2100ap FirmwareApplication
Affected:<= 2.50
Dwl 3200apHardware / appliance
Affected:all versions
Dwl 3200ap FirmwareApplication
Affected:<= 2.55= 2.40

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device model
    Log into the device web interface or console and locate the product model name. For DES-3800, look for 'DES-3800' in the device info. For access points, look for 'DWL-2100AP' or 'DWL-3200AP'.
    Affected if The device model is not DES-3800, DWL-2100AP, or DWL-3200AP.
  2. Check the firmware version
    In the device web interface, navigate to the System or Status section to view the current firmware version. From console, use the 'show version' or 'show firmware' command depending on the device CLI.
    Affected if The firmware version is 4.50 or lower for DES-3800, 2.50 or lower for DWL-2100AP, or 2.55 or lower (or 2.40) for DWL-3200AP.
  3. Confirm SSH is enabled
    From the console, use 'show ip ssh' or 'show ssh status' command. From the web interface, check the SSH service settings under the Management or Services section.
    Affected if SSH service is enabled and accessible on the device.
  4. Verify SSH service is reachable
    Attempt an SSH connection to the device IP address on port 22 using an SSH client. Confirm the connection attempt reaches the device.
    Affected if The device accepts SSH connections on port 22.

The device is affected if it is a D-Link DES-3800, DWL-2100AP, or DWL-3200AP running firmware at or below the affected version ranges AND SSH is enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 4.50
Interim mitigation

Update affected devices to firmware versions 4.50B052 (DES-3800), 2.50RC548 (DWL-2100AP), or 2.55RC549 (DWL-3200AP) or later. If firmware updates are unavailable, disable SSH access and use alternative management methods, or restrict network access to management interfaces.

Recommended fix High confidence

DES-3800: firmware 4.50B052 or later | DWL-2100AP: firmware 2.50RC548 or later | DWL-3200AP: firmware 2.55RC549 or later

  1. 1. Identify the specific D-Link device model (DES-3800, DWL-2100AP, or DWL-3200AP) from your inventory
  2. 2. Access the device's web management interface or CLI to determine the current firmware version
  3. 3. Download the appropriate fixed firmware from D-Link's official support website: For DES-3800 use firmware 4.50B052 or later; For DWL-2100AP use firmware 2.50RC548 or later; For DWL-3200AP use firmware 2.55RC549 or later
  4. 4. Back up the current device configuration as a precautionary measure
  5. 5. Upload the new firmware file via the device's web interface or through CLI using TFTP
  6. 6. After installation, verify the firmware version and confirm the device is functioning normally
  7. 7. Verify SSH access is working properly after the upgrade
Caveat Standard firmware upgrade risks apply - ensure power stability during upload and verify configuration compatibility after upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Des 3800 Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-3992 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data